diff --git a/backend/package-lock.json b/backend/package-lock.json
index 1210f09..e877cc0 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -9,6 +9,7 @@
 			"version": "1.0.0",
 			"license": "ISC",
 			"dependencies": {
+				"@prisma/client": "^6.2.1",
 				"debug": "^4.4.0",
 				"dotenv": "^16.4.7",
 				"koa": "^2.15.3",
@@ -22,6 +23,7 @@
 				"@types/koa-route": "^3.2.8",
 				"@types/node": "^14.0.0",
 				"nodemon": "^3.1.9",
+				"prisma": "^6.2.1",
 				"ts-node": "^10.0.0",
 				"typedoc": "^0.27.6",
 				"typescript": "^5.7.3"
@@ -80,6 +82,68 @@
 				"@jridgewell/sourcemap-codec": "^1.4.10"
 			}
 		},
+		"node_modules/@prisma/client": {
+			"version": "6.2.1",
+			"resolved": "https://registry.npmjs.org/@prisma/client/-/client-6.2.1.tgz",
+			"integrity": "sha512-msKY2iRLISN8t5X0Tj7hU0UWet1u0KuxSPHWuf3IRkB4J95mCvGpyQBfQ6ufcmvKNOMQSq90O2iUmJEN2e5fiA==",
+			"hasInstallScript": true,
+			"engines": {
+				"node": ">=18.18"
+			},
+			"peerDependencies": {
+				"prisma": "*"
+			},
+			"peerDependenciesMeta": {
+				"prisma": {
+					"optional": true
+				}
+			}
+		},
+		"node_modules/@prisma/debug": {
+			"version": "6.2.1",
+			"resolved": "https://registry.npmjs.org/@prisma/debug/-/debug-6.2.1.tgz",
+			"integrity": "sha512-0KItvt39CmQxWkEw6oW+RQMD6RZ43SJWgEUnzxN8VC9ixMysa7MzZCZf22LCK5DSooiLNf8vM3LHZm/I/Ni7bQ==",
+			"devOptional": true
+		},
+		"node_modules/@prisma/engines": {
+			"version": "6.2.1",
+			"resolved": "https://registry.npmjs.org/@prisma/engines/-/engines-6.2.1.tgz",
+			"integrity": "sha512-lTBNLJBCxVT9iP5I7Mn6GlwqAxTpS5qMERrhebkUhtXpGVkBNd/jHnNJBZQW4kGDCKaQg/r2vlJYkzOHnAb7ZQ==",
+			"devOptional": true,
+			"hasInstallScript": true,
+			"dependencies": {
+				"@prisma/debug": "6.2.1",
+				"@prisma/engines-version": "6.2.0-14.4123509d24aa4dede1e864b46351bf2790323b69",
+				"@prisma/fetch-engine": "6.2.1",
+				"@prisma/get-platform": "6.2.1"
+			}
+		},
+		"node_modules/@prisma/engines-version": {
+			"version": "6.2.0-14.4123509d24aa4dede1e864b46351bf2790323b69",
+			"resolved": "https://registry.npmjs.org/@prisma/engines-version/-/engines-version-6.2.0-14.4123509d24aa4dede1e864b46351bf2790323b69.tgz",
+			"integrity": "sha512-7tw1qs/9GWSX6qbZs4He09TOTg1ff3gYsB3ubaVNN0Pp1zLm9NC5C5MZShtkz7TyQjx7blhpknB7HwEhlG+PrQ==",
+			"devOptional": true
+		},
+		"node_modules/@prisma/fetch-engine": {
+			"version": "6.2.1",
+			"resolved": "https://registry.npmjs.org/@prisma/fetch-engine/-/fetch-engine-6.2.1.tgz",
+			"integrity": "sha512-OO7O9d6Mrx2F9i+Gu1LW+DGXXyUFkP7OE5aj9iBfA/2jjDXEJjqa9X0ZmM9NZNo8Uo7ql6zKm6yjDcbAcRrw1A==",
+			"devOptional": true,
+			"dependencies": {
+				"@prisma/debug": "6.2.1",
+				"@prisma/engines-version": "6.2.0-14.4123509d24aa4dede1e864b46351bf2790323b69",
+				"@prisma/get-platform": "6.2.1"
+			}
+		},
+		"node_modules/@prisma/get-platform": {
+			"version": "6.2.1",
+			"resolved": "https://registry.npmjs.org/@prisma/get-platform/-/get-platform-6.2.1.tgz",
+			"integrity": "sha512-zp53yvroPl5m5/gXYLz7tGCNG33bhG+JYCm74ohxOq1pPnrL47VQYFfF3RbTZ7TzGWCrR3EtoiYMywUBw7UK6Q==",
+			"devOptional": true,
+			"dependencies": {
+				"@prisma/debug": "6.2.1"
+			}
+		},
 		"node_modules/@shikijs/engine-oniguruma": {
 			"version": "1.26.1",
 			"resolved": "https://registry.npmjs.org/@shikijs/engine-oniguruma/-/engine-oniguruma-1.26.1.tgz",
@@ -1339,6 +1403,25 @@
 				"url": "https://github.com/sponsors/jonschlinkert"
 			}
 		},
+		"node_modules/prisma": {
+			"version": "6.2.1",
+			"resolved": "https://registry.npmjs.org/prisma/-/prisma-6.2.1.tgz",
+			"integrity": "sha512-hhyM0H13pQleQ+br4CkzGizS5I0oInoeTw3JfLw1BRZduBSQxPILlJLwi+46wZzj9Je7ndyQEMGw/n5cN2fknA==",
+			"devOptional": true,
+			"hasInstallScript": true,
+			"dependencies": {
+				"@prisma/engines": "6.2.1"
+			},
+			"bin": {
+				"prisma": "build/index.js"
+			},
+			"engines": {
+				"node": ">=18.18"
+			},
+			"optionalDependencies": {
+				"fsevents": "2.3.3"
+			}
+		},
 		"node_modules/pstree.remy": {
 			"version": "1.1.8",
 			"resolved": "https://registry.npmjs.org/pstree.remy/-/pstree.remy-1.1.8.tgz",
diff --git a/backend/package.json b/backend/package.json
index 30527e4..a61bca6 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -15,6 +15,7 @@
 		"@types/koa-route": "^3.2.8",
 		"@types/node": "^14.0.0",
 		"nodemon": "^3.1.9",
+		"prisma": "^6.2.1",
 		"ts-node": "^10.0.0",
 		"typedoc": "^0.27.6",
 		"typescript": "^5.7.3"
@@ -23,6 +24,7 @@
 	"license": "ISC",
 	"description": "",
 	"dependencies": {
+		"@prisma/client": "^6.2.1",
 		"debug": "^4.4.0",
 		"dotenv": "^16.4.7",
 		"koa": "^2.15.3",
diff --git a/backend/prisma/migrations/20250111194859_init/migration.sql b/backend/prisma/migrations/20250111194859_init/migration.sql
new file mode 100644
index 0000000..8d19f9e
--- /dev/null
+++ b/backend/prisma/migrations/20250111194859_init/migration.sql
@@ -0,0 +1,47 @@
+-- CreateTable
+CREATE TABLE `Payer` (
+    `payer_id` INTEGER NOT NULL AUTO_INCREMENT,
+    `payer_name` VARCHAR(100) NOT NULL,
+    `payer_address` VARCHAR(255) NOT NULL,
+    `payer_abn` VARCHAR(15) NULL,
+    `payer_email` VARCHAR(100) NOT NULL,
+
+    PRIMARY KEY (`payer_id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- CreateTable
+CREATE TABLE `Invoice` (
+    `payer_id` INTEGER NOT NULL,
+    `invoice_suffix_code` INTEGER NOT NULL,
+    `invoice_payer_name` VARCHAR(100) NOT NULL,
+    `invoice_payer_address` VARCHAR(255) NOT NULL,
+    `invoice_payer_abn` VARCHAR(15) NULL,
+    `invoice_billing_period_start` DATETIME(3) NOT NULL,
+    `invoice_billing_period_end` DATETIME(3) NOT NULL,
+    `invoice_due_date` DATETIME(3) NOT NULL,
+    `invoice_date` DATETIME(3) NOT NULL,
+    `invoice_total_amount` DECIMAL(10, 2) NOT NULL,
+    `invoice_note` TEXT NULL,
+
+    PRIMARY KEY (`invoice_date`, `invoice_suffix_code`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- CreateTable
+CREATE TABLE `InvoiceItem` (
+    `item_id` INTEGER NOT NULL,
+    `invoice_date` DATETIME(3) NOT NULL,
+    `invoice_suffix_code` INTEGER NOT NULL,
+    `item_description` VARCHAR(255) NOT NULL,
+    `item_quantity` INTEGER NOT NULL,
+    `item_unit_price` DECIMAL(10, 2) NOT NULL,
+    `item_unit` VARCHAR(50) NOT NULL,
+    `invoice_id` INTEGER NOT NULL,
+
+    PRIMARY KEY (`item_id`, `invoice_date`, `invoice_suffix_code`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- AddForeignKey
+ALTER TABLE `Invoice` ADD CONSTRAINT `Invoice_payer_id_fkey` FOREIGN KEY (`payer_id`) REFERENCES `Payer`(`payer_id`) ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE `InvoiceItem` ADD CONSTRAINT `InvoiceItem_invoice_date_invoice_suffix_code_fkey` FOREIGN KEY (`invoice_date`, `invoice_suffix_code`) REFERENCES `Invoice`(`invoice_date`, `invoice_suffix_code`) ON DELETE RESTRICT ON UPDATE CASCADE;
diff --git a/backend/prisma/migrations/migration_lock.toml b/backend/prisma/migrations/migration_lock.toml
new file mode 100644
index 0000000..8a21669
--- /dev/null
+++ b/backend/prisma/migrations/migration_lock.toml
@@ -0,0 +1,3 @@
+# Please do not edit this file manually
+# It should be added in your version-control system (e.g., Git)
+provider = "mysql"
\ No newline at end of file
diff --git a/backend/prisma/schema.prisma b/backend/prisma/schema.prisma
new file mode 100644
index 0000000..4c742d5
--- /dev/null
+++ b/backend/prisma/schema.prisma
@@ -0,0 +1,55 @@
+// This is your Prisma schema file,
+// learn more about it in the docs: https://pris.ly/d/prisma-schema
+
+// Looking for ways to speed up your queries, or scale easily with your serverless or edge functions?
+// Try Prisma Accelerate: https://pris.ly/cli/accelerate-init
+
+generator client {
+	provider = "prisma-client-js"
+}
+
+datasource db {
+	provider = "mysql"
+	url      = env("DB_CONNECTION")
+}
+
+model Payer {
+	payer_id     Int      @id @default(autoincrement())
+	payer_name   String   @db.VarChar(100)
+	payer_address String  @db.VarChar(255)
+	payer_abn    String?  @db.VarChar(15)
+	payer_email  String   @db.VarChar(100)
+	invoices     Invoice[]
+}
+
+model Invoice {
+	payer_id                  Int      
+	invoice_suffix_code       Int
+	invoice_payer_name        String   @db.VarChar(100)
+	invoice_payer_address     String   @db.VarChar(255)
+	invoice_payer_abn         String?  @db.VarChar(15)
+	invoice_billing_period_start DateTime
+	invoice_billing_period_end DateTime
+	invoice_due_date          DateTime
+	invoice_date              DateTime
+	invoice_total_amount      Decimal  @db.Decimal(10, 2)
+	invoice_note              String?  @db.Text
+	payer                     Payer    @relation(fields: [payer_id], references: [payer_id])
+	invoice_items             InvoiceItem[]
+
+	@@id([invoice_date, invoice_suffix_code])
+}
+
+model InvoiceItem {
+	item_id            Int
+	invoice_date       DateTime @map("invoice_date")
+	invoice_suffix_code Int     @map("invoice_suffix_code")
+	item_description   String   @db.VarChar(255)
+	item_quantity      Int
+	item_unit_price    Decimal  @db.Decimal(10, 2)
+	item_unit          String   @db.VarChar(50)
+	invoice_id         Int
+	invoice            Invoice  @relation(fields: [invoice_date, invoice_suffix_code], references: [invoice_date, invoice_suffix_code])
+
+	@@id([item_id, invoice_date, invoice_suffix_code])
+}
\ No newline at end of file
diff --git a/backend/src/app.ts b/backend/src/app.ts
index dc88a85..85a3902 100644
--- a/backend/src/app.ts
+++ b/backend/src/app.ts
@@ -4,6 +4,7 @@ import route from 'koa-route'
 import Debug from 'debug'
 import koaBody from 'koa-body'
 import func from './func'
+import { ErrorDescEnum, HttpError } from './types/HttpError'
 
 dotenv.config()
 console.log = Debug('invoiceIssuer:app.ts')
@@ -11,32 +12,50 @@ console.log = Debug('invoiceIssuer:app.ts')
 const app = new Koa()
 app.use(koaBody())
 
+// 错误处理中间件
+app.use(async (ctx, next) => {
+	try {
+		await next()
+	} catch (e) {
+		if (e instanceof HttpError) {
+			ctx.status = e.status
+			ctx.body = JSON.stringify({ error: e.message })
+		} else {
+			console.log(e)
+			ctx.status = 500
+			ctx.body = JSON.stringify({ error: ErrorDescEnum.unknown_issues })
+		}
+	}
+})
+
 app.use(route.get('/', (ctx) => {
 	ctx.body = 'Hello World'
 }))
 
 app.use(route.post('/payer', async (ctx) => {
 	// TODO: 请求头验证 bearer token
-	
+
+	// 验证必填字段
+	// 字段缺失时
+	if (!ctx.request.body) throw new HttpError(ErrorDescEnum.required_fields_missing, 400)
+
+	// 有字段，但为空时
 	const { name, address, email, abn } = ctx.request.body
-	if (!name || !address || !email) ctx.throw(400, 'required_fields_missing')
+	if (!name || !address || !email) throw new HttpError(ErrorDescEnum.required_fields_missing, 400)
+
+	// 验证地址格式，格式应为 string[]，最多两行
+	if (!Array.isArray(address) || address.length > 2 || address.length <= 0) throw new HttpError(ErrorDescEnum.invalid_field_format, 400)
+
+	// 名字应为字符串
+	if (typeof name !== 'string') throw new HttpError(ErrorDescEnum.invalid_field_format, 400)
 	
 	// 验证邮箱格式
 	const emailRegex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/
-	if (!emailRegex.test(email)) ctx.throw(400, 'invalid_field_format')
+	if (!emailRegex.test(email)) throw new HttpError(ErrorDescEnum.invalid_field_format, 400)
 
-	try {
-		const payer = await func.createPayer(name, address, email, abn)
-		ctx.body = payer
-	} catch (e) {
-		if (e instanceof HttpError) {
-			ctx.status = e.status
-			ctx.body = e.message
-		} else {
-			console.error(e)
-			ctx.throw(500, 'unknown_issues')
-		}
-	}
+	// 创建新的付款人
+	await func.createPayer(name, address, email, abn)
+	ctx.status = 204
 }))
 
 const port = parseInt(process.env.PORT ?? '3000')
diff --git a/backend/src/func/createPayer.ts b/backend/src/func/createPayer.ts
index f3f0932..796c1cc 100644
--- a/backend/src/func/createPayer.ts
+++ b/backend/src/func/createPayer.ts
@@ -1,3 +1,8 @@
+import Debug from 'debug'
+import { PrismaClient } from '@prisma/client'
+
+console.log = Debug('invoiceIssuer:func/createPayer.ts')
+
 /**
  * POST /payer
  * @summary 创建一个新的付款人。这个付款人与收据上标识的收款人信息分离，但内部数据库关联（以便检索）。
@@ -7,4 +12,23 @@
  * @param {string} abn - 付款人的澳大利亚商业号码
  */
 export default async (name: string, address: string[], email: string, abn?: string) => {
+	const prisma = new PrismaClient()
+
+	try {
+		// 创建新的付款人
+		const payer = await prisma.payer.create({
+			data: {
+				payer_name: name,
+				payer_address: address.join('\n'),
+				payer_email: email,
+				payer_abn: abn
+			}
+		})
+		return payer
+	} catch (e) {
+		console.log(e)
+		throw new Error('unknown_issues')
+	} finally {
+		await prisma.$disconnect()
+	}
 }
\ No newline at end of file
diff --git a/backend/src/types/HttpError.d.ts b/backend/src/types/HttpError.ts
similarity index 81%
rename from backend/src/types/HttpError.d.ts
rename to backend/src/types/HttpError.ts
index 72ff10d..c767f44 100644
--- a/backend/src/types/HttpError.d.ts
+++ b/backend/src/types/HttpError.ts
@@ -8,7 +8,14 @@ class HttpError extends Error {
 	 * @param message 错误的消息。
 	 * @param status 错误的状态码。
 	 */
-	constructor(message: ErrorDescEnum, status: number);
+	constructor(message: ErrorDescEnum, status: 400 | 401 | 403 | 404 | 500) {
+		super(message);
+		this.status = status;
+	}
+	
+	/**
+	 * 错误的状态码。
+	 */
 	status: 400 | 401 | 403 | 404 | 500;
 }
 
@@ -28,4 +35,6 @@ enum ErrorDescEnum {
 	 * 未知错误。通常与 HTTP 状态码 500 Internal Server Error 一起使用。
 	 */
 	unknown_issues = 'unknown_issues'
-}
\ No newline at end of file
+}
+
+export { HttpError, ErrorDescEnum }
\ No newline at end of file