diff --git a/src/backend/memo/__init__.py b/src/backend/memo/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/backend/memo/admin.py b/src/backend/memo/admin.py
new file mode 100644
index 0000000..96014b4
--- /dev/null
+++ b/src/backend/memo/admin.py
@@ -0,0 +1,28 @@
+from django.contrib import admin
+from .models import Memo, MemoImage
+
+
+class MemoImageInline(admin.TabularInline):
+    model = MemoImage
+    extra = 0
+
+
+@admin.register(Memo)
+class MemoAdmin(admin.ModelAdmin):
+    list_display = ['title', 'created_by', 'created_at', 'updated_at', 'is_active']
+    list_filter = ['is_active', 'created_at', 'updated_at']
+    search_fields = ['title', 'content']
+    readonly_fields = ['created_at', 'updated_at']
+    inlines = [MemoImageInline]
+
+    def save_model(self, request, obj, form, change):
+        if not change:
+            obj.created_by = request.user
+        super().save_model(request, obj, form, change)
+
+
+@admin.register(MemoImage)
+class MemoImageAdmin(admin.ModelAdmin):
+    list_display = ['memo', 'alt_text', 'uploaded_at']
+    list_filter = ['uploaded_at']
+    search_fields = ['memo__title', 'alt_text']
diff --git a/src/backend/memo/apps.py b/src/backend/memo/apps.py
new file mode 100644
index 0000000..abd08f6
--- /dev/null
+++ b/src/backend/memo/apps.py
@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class MemoConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "memo"
diff --git a/src/backend/memo/models.py b/src/backend/memo/models.py
new file mode 100644
index 0000000..fb1cad0
--- /dev/null
+++ b/src/backend/memo/models.py
@@ -0,0 +1,40 @@
+from django.db import models
+from django.contrib.auth.models import User
+
+
+class Memo(models.Model):
+    title = models.CharField(max_length=200, verbose_name="标题")
+    content = models.TextField(verbose_name="内容", blank=True)
+    created_by = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="创建者")
+    created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
+    updated_at = models.DateTimeField(auto_now=True, verbose_name="更新时间")
+    is_active = models.BooleanField(default=True, verbose_name="是否启用")
+
+    class Meta:
+        verbose_name = "备忘录"
+        verbose_name_plural = "备忘录"
+        ordering = ['-updated_at']
+
+    def __str__(self):
+        return self.title
+
+    @property
+    def content_preview(self):
+        """返回内容的缩略预览"""
+        if len(self.content) > 100:
+            return self.content[:100] + "..."
+        return self.content
+
+
+class MemoImage(models.Model):
+    memo = models.ForeignKey(Memo, on_delete=models.CASCADE, related_name='images', verbose_name="备忘录")
+    image = models.ImageField(upload_to='memo_images/', verbose_name="图片")
+    uploaded_at = models.DateTimeField(auto_now_add=True, verbose_name="上传时间")
+    alt_text = models.CharField(max_length=200, blank=True, verbose_name="图片描述")
+
+    class Meta:
+        verbose_name = "备忘录图片"
+        verbose_name_plural = "备忘录图片"
+
+    def __str__(self):
+        return f"{self.memo.title} - 图片"
diff --git a/src/backend/memo/serializers.py b/src/backend/memo/serializers.py
new file mode 100644
index 0000000..fa56771
--- /dev/null
+++ b/src/backend/memo/serializers.py
@@ -0,0 +1,33 @@
+from rest_framework import serializers
+from .models import Memo, MemoImage
+
+
+class MemoImageSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = MemoImage
+        fields = ['id', 'image', 'uploaded_at', 'alt_text']
+
+
+class MemoSerializer(serializers.ModelSerializer):
+    images = MemoImageSerializer(many=True, read_only=True)
+    content_preview = serializers.ReadOnlyField()
+    created_by_name = serializers.CharField(source='created_by.username', read_only=True)
+
+    class Meta:
+        model = Memo
+        fields = ['id', 'title', 'content', 'content_preview', 'created_by', 'created_by_name',
+                 'created_at', 'updated_at', 'is_active', 'images']
+        read_only_fields = ['created_by', 'created_at', 'updated_at']
+
+    def create(self, validated_data):
+        validated_data['created_by'] = self.context['request'].user
+        return super().create(validated_data)
+
+
+class MemoListSerializer(serializers.ModelSerializer):
+    content_preview = serializers.ReadOnlyField()
+    created_by_name = serializers.CharField(source='created_by.username', read_only=True)
+
+    class Meta:
+        model = Memo
+        fields = ['id', 'title', 'content_preview', 'created_by_name', 'updated_at']
\ No newline at end of file
diff --git a/src/backend/memo/tests.py b/src/backend/memo/tests.py
new file mode 100644
index 0000000..7ce503c
--- /dev/null
+++ b/src/backend/memo/tests.py
@@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.
diff --git a/src/backend/memo/urls.py b/src/backend/memo/urls.py
new file mode 100644
index 0000000..555ebb0
--- /dev/null
+++ b/src/backend/memo/urls.py
@@ -0,0 +1,10 @@
+from django.urls import path, include
+from rest_framework.routers import DefaultRouter
+from .views import MemoViewSet
+
+router = DefaultRouter()
+router.register(r'memos', MemoViewSet)
+
+urlpatterns = [
+    path('api/', include(router.urls)),
+]
\ No newline at end of file
diff --git a/src/backend/memo/views.py b/src/backend/memo/views.py
new file mode 100644
index 0000000..609f471
--- /dev/null
+++ b/src/backend/memo/views.py
@@ -0,0 +1,61 @@
+from rest_framework import viewsets, filters, status
+from rest_framework.decorators import action
+from rest_framework.response import Response
+from rest_framework.parsers import MultiPartParser, FormParser
+from django_filters.rest_framework import DjangoFilterBackend
+from django.db.models import Q
+from .models import Memo, MemoImage
+from .serializers import MemoSerializer, MemoListSerializer, MemoImageSerializer
+
+
+class MemoViewSet(viewsets.ModelViewSet):
+    queryset = Memo.objects.filter(is_active=True)
+    serializer_class = MemoSerializer
+    filter_backends = [DjangoFilterBackend, filters.SearchFilter, filters.OrderingFilter]
+    search_fields = ['title', 'content']
+    ordering_fields = ['created_at', 'updated_at']
+    ordering = ['-updated_at']
+
+    def get_serializer_class(self):
+        if self.action == 'list':
+            return MemoListSerializer
+        return MemoSerializer
+
+    def get_queryset(self):
+        queryset = super().get_queryset()
+        search = self.request.query_params.get('search', None)
+        if search:
+            queryset = queryset.filter(
+                Q(title__icontains=search) | Q(content__icontains=search)
+            )
+        return queryset
+
+    @action(detail=True, methods=['post'], parser_classes=[MultiPartParser, FormParser])
+    def upload_image(self, request, pk=None):
+        memo = self.get_object()
+        image = request.FILES.get('image')
+        alt_text = request.data.get('alt_text', '')
+
+        if not image:
+            return Response({'error': '请选择图片文件'}, status=status.HTTP_400_BAD_REQUEST)
+
+        memo_image = MemoImage.objects.create(
+            memo=memo,
+            image=image,
+            alt_text=alt_text
+        )
+
+        serializer = MemoImageSerializer(memo_image)
+        return Response(serializer.data, status=status.HTTP_201_CREATED)
+
+    @action(detail=True, methods=['delete'])
+    def delete_image(self, request, pk=None):
+        memo = self.get_object()
+        image_id = request.data.get('image_id')
+
+        try:
+            memo_image = MemoImage.objects.get(id=image_id, memo=memo)
+            memo_image.delete()
+            return Response({'message': '图片删除成功'}, status=status.HTTP_200_OK)
+        except MemoImage.DoesNotExist:
+            return Response({'error': '图片不存在'}, status=status.HTTP_404_NOT_FOUND)