diff --git a/backend/package-lock.json b/backend/package-lock.json
index 38c944b..f92e1c4 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -19,6 +19,8 @@
 				"koa": "^2.15.3",
 				"koa-body": "^6.0.1",
 				"koa-route": "^4.0.1",
+				"marked": "^15.0.6",
+				"nodemailer": "^6.9.16",
 				"npm": "^11.0.0",
 				"puppeteer": "^24.0.0"
 			},
@@ -28,6 +30,7 @@
 				"@types/koa": "^2.15.0",
 				"@types/koa-route": "^3.2.8",
 				"@types/node": "^14.0.0",
+				"@types/nodemailer": "^6.4.17",
 				"nodemon": "^3.1.9",
 				"prisma": "^6.2.1",
 				"ts-node": "^10.0.0",
@@ -423,6 +426,16 @@
 			"resolved": "https://registry.npmjs.org/@types/node/-/node-14.18.63.tgz",
 			"integrity": "sha512-fAtCfv4jJg+ExtXhvCkCqUKZ+4ok/JQk01qDKhL5BDDoS3AxKXhV5/MAVUZyQnSEd2GT92fkgZl0pz0Q0AzcIQ=="
 		},
+		"node_modules/@types/nodemailer": {
+			"version": "6.4.17",
+			"resolved": "https://registry.npmjs.org/@types/nodemailer/-/nodemailer-6.4.17.tgz",
+			"integrity": "sha512-I9CCaIp6DTldEg7vyUTZi8+9Vo0hi1/T8gv3C89yk1rSAAzoKQ8H8ki/jBYJSFoH/BisgLP8tkZMlQ91CIquww==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@types/node": "*"
+			}
+		},
 		"node_modules/@types/qs": {
 			"version": "6.9.17",
 			"resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.17.tgz",
@@ -1902,6 +1915,18 @@
 				"markdown-it": "bin/markdown-it.mjs"
 			}
 		},
+		"node_modules/marked": {
+			"version": "15.0.6",
+			"resolved": "https://registry.npmjs.org/marked/-/marked-15.0.6.tgz",
+			"integrity": "sha512-Y07CUOE+HQXbVDCGl3LXggqJDbXDP2pArc2C1N1RRMN0ONiShoSsIInMd5Gsxupe7fKLpgimTV+HOJ9r7bA+pg==",
+			"license": "MIT",
+			"bin": {
+				"marked": "bin/marked.js"
+			},
+			"engines": {
+				"node": ">= 18"
+			}
+		},
 		"node_modules/math-intrinsics": {
 			"version": "1.1.0",
 			"resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",
@@ -2004,6 +2029,15 @@
 				"node": ">= 0.4.0"
 			}
 		},
+		"node_modules/nodemailer": {
+			"version": "6.9.16",
+			"resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.9.16.tgz",
+			"integrity": "sha512-psAuZdTIRN08HKVd/E8ObdV6NO7NTBY3KsC30F7M4H1OnmLCUNaS56FpYxyb26zWLSyYF9Ozch9KYHhHegsiOQ==",
+			"license": "MIT-0",
+			"engines": {
+				"node": ">=6.0.0"
+			}
+		},
 		"node_modules/nodemon": {
 			"version": "3.1.9",
 			"resolved": "https://registry.npmjs.org/nodemon/-/nodemon-3.1.9.tgz",
diff --git a/backend/package.json b/backend/package.json
index 475fc59..c9d3615 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -14,6 +14,7 @@
 		"@types/koa": "^2.15.0",
 		"@types/koa-route": "^3.2.8",
 		"@types/node": "^14.0.0",
+		"@types/nodemailer": "^6.4.17",
 		"nodemon": "^3.1.9",
 		"prisma": "^6.2.1",
 		"ts-node": "^10.0.0",
@@ -34,6 +35,8 @@
 		"koa": "^2.15.3",
 		"koa-body": "^6.0.1",
 		"koa-route": "^4.0.1",
+		"marked": "^15.0.6",
+		"nodemailer": "^6.9.16",
 		"npm": "^11.0.0",
 		"puppeteer": "^24.0.0"
 	}
diff --git a/backend/src/func/issueInvoice.ts b/backend/src/func/issueInvoice.ts
index c41f55d..e9c9f65 100644
--- a/backend/src/func/issueInvoice.ts
+++ b/backend/src/func/issueInvoice.ts
@@ -7,6 +7,8 @@ import { readFileSync } from 'fs'
 import dayjs from 'dayjs'
 import handlebars from 'handlebars'
 import puppeteer from 'puppeteer'
+import nodemailer from 'nodemailer'
+import marked from 'marked'
 
 console.log = Debug('invoiceIssuer:func/issueInvoice.ts')
 
@@ -102,8 +104,7 @@ export default async (prisma: PrismaClient, payerId: number, period: Date[], ite
 	const browser = await puppeteer.launch()
 	const page = await browser.newPage()
 	await page.setContent(html)
-	await page.pdf({
-		path: `./dist/${invoiceNumber}.pdf`,
+	const invoiceFile = await page.pdf({
 		format: 'A4',
 		printBackground: true,
 		margin: {
@@ -113,5 +114,43 @@ export default async (prisma: PrismaClient, payerId: number, period: Date[], ite
 			left: '1cm'
 		}
 	})
+	const invoiceBuffer = Buffer.from(invoiceFile)
 	await browser.close()
+
+	// 发送邮件
+	const transporter = nodemailer.createTransport({
+		host: process.env.SMTP_HOST,
+		port: parseInt(process.env.SMTP_PORT || '465'),
+		secure: true,
+		auth: {
+			user: process.env.SMTP_USER,
+			pass: process.env.SMTP_PASS
+		}
+	})
+
+	const mailMarkdownTemplate = readFileSync('./src/resources/mail.md', 'utf-8')
+	const mailData = {
+		payerName: payerInfo.name,
+		periodStart: dayjs(period[0]).format('D, MMMM YYYY'),
+		periodEnd: dayjs(period[1]).format('D, MMMM YYYY'),
+		invoiceNumber: invoiceNumber,
+		invoiceAmount: `\$${newInvoice.getTotal().toFixed(2)}`,
+		payeeName: data.payee.name,
+	}
+	const mailRender = handlebars.compile(mailMarkdownTemplate)
+	const mailText = mailRender(mailData)
+
+	const mailOptions = {
+		from: process.env.SMTP_USER,
+		to: payerInfo.email,
+		subject: `Invoice ${invoiceNumber}`,
+		html: await marked.parse(mailText),
+		attachments: [
+			{
+				filename: `${invoiceNumber}.pdf`,
+				content: invoiceBuffer
+			}
+		]
+	}
+	await transporter.sendMail(mailOptions)
 }
\ No newline at end of file
diff --git a/backend/src/resources/mail.md b/backend/src/resources/mail.md
new file mode 100644
index 0000000..eb9f57e
--- /dev/null
+++ b/backend/src/resources/mail.md
@@ -0,0 +1,12 @@
+Dear {{payerName}},
+
+I hope this email finds you well. Per our agreement, the invoice for {{periodStart}} ~ {{periodEnd}} is attached. Kindly review it at your earliest convenience and let me know if any questions or clarifications are required.
+
+Details of the Invoice:
+
+- Invoice Number: #{{invoiceNumber}}
+- Amount: {{invoiceAmount}}
+
+Thank you for your prompt attention to this matter. I appreciate your support and look forward to your confirmation.
+
+Best regards,<br>{{payeeName}}