diff --git a/MiGu.Server/MiGu.Server.csproj b/MiGu.Server/MiGu.Server.csproj
index 3e818bc..8bde202 100644
--- a/MiGu.Server/MiGu.Server.csproj
+++ b/MiGu.Server/MiGu.Server.csproj
@@ -20,6 +20,8 @@
 
   <ItemGroup>
     <None Include="data\.gitkeep" Condition="Exists('data\.gitkeep')" />
+    <Content Include="OpenApi\simplelite-projection.json" Link="OpenApi\simplelite-projection.json" CopyToOutputDirectory="PreserveNewest" Condition="Exists('OpenApi\simplelite-projection.json')" />
+    <Content Include="..\..\Simple\SimpleLite\Docs\openapi\simplelite-projection.json" Link="OpenApi\simplelite-projection.json" CopyToOutputDirectory="PreserveNewest" Condition="Exists('..\..\Simple\SimpleLite\Docs\openapi\simplelite-projection.json')" />
   </ItemGroup>
 
 </Project>
diff --git a/MiGu.Server/OpenApi/SimpleLiteOpenApiDocumentFilter.cs b/MiGu.Server/OpenApi/SimpleLiteOpenApiDocumentFilter.cs
new file mode 100644
index 0000000..07d1468
--- /dev/null
+++ b/MiGu.Server/OpenApi/SimpleLiteOpenApiDocumentFilter.cs
@@ -0,0 +1,183 @@
+using System.Text.Json;
+using Microsoft.OpenApi.Models;
+using Swashbuckle.AspNetCore.SwaggerGen;
+
+namespace MiGu.Server.OpenApi;
+
+/// <summary>
+/// 将 SimpleLite EmbedIO WebApi 的 OpenAPI 描述合并进 MiGu.Server Swagger 文档。
+/// 源文件：Simple/SimpleLite/Docs/openapi/simplelite-projection.json
+/// </summary>
+public sealed class SimpleLiteOpenApiDocumentFilter : IDocumentFilter
+{
+    private static readonly Dictionary<string, OperationType> VerbMap = new(StringComparer.OrdinalIgnoreCase)
+    {
+        ["get"] = OperationType.Get,
+        ["post"] = OperationType.Post,
+        ["put"] = OperationType.Put,
+        ["patch"] = OperationType.Patch,
+        ["delete"] = OperationType.Delete,
+        ["head"] = OperationType.Head,
+        ["options"] = OperationType.Options,
+        ["trace"] = OperationType.Trace
+    };
+
+    public void Apply(OpenApiDocument swaggerDoc, DocumentFilterContext context)
+    {
+        var json = TryLoadJson();
+        if (json == null) return;
+
+        using var doc = JsonDocument.Parse(json);
+        var root = doc.RootElement;
+
+        if (root.TryGetProperty("tags", out var tagsEl) && tagsEl.ValueKind == JsonValueKind.Array)
+        {
+            swaggerDoc.Tags ??= new List<OpenApiTag>();
+            foreach (var tag in tagsEl.EnumerateArray())
+            {
+                if (!tag.TryGetProperty("name", out var nameEl)) continue;
+                var name = nameEl.GetString();
+                if (string.IsNullOrEmpty(name) || swaggerDoc.Tags.Any(t => t.Name == name)) continue;
+                var desc = tag.TryGetProperty("description", out var d) ? d.GetString() : null;
+                swaggerDoc.Tags.Add(new OpenApiTag { Name = name, Description = desc });
+            }
+        }
+
+        if (!root.TryGetProperty("paths", out var pathsEl)) return;
+
+        foreach (var pathProp in pathsEl.EnumerateObject())
+        {
+            var fullPath = pathProp.Name.StartsWith("/api/sl", StringComparison.Ordinal)
+                ? pathProp.Name
+                : "/api/sl" + pathProp.Name;
+
+            var pathItem = new OpenApiPathItem();
+            foreach (var opProp in pathProp.Value.EnumerateObject())
+            {
+                if (!VerbMap.TryGetValue(opProp.Name, out var verb)) continue;
+                pathItem.Operations[verb] = ParseOperation(opProp.Value);
+            }
+
+            if (pathItem.Operations.Count > 0)
+                swaggerDoc.Paths[fullPath] = pathItem;
+        }
+    }
+
+    private static OpenApiOperation ParseOperation(JsonElement el)
+    {
+        var op = new OpenApiOperation
+        {
+            Summary = el.TryGetProperty("summary", out var s) ? s.GetString() : null,
+            Description = el.TryGetProperty("description", out var d) ? d.GetString() : null
+        };
+
+        if (el.TryGetProperty("tags", out var tags) && tags.ValueKind == JsonValueKind.Array)
+        {
+            foreach (var t in tags.EnumerateArray())
+            {
+                var name = t.GetString();
+                if (!string.IsNullOrEmpty(name))
+                    op.Tags.Add(new OpenApiTag { Name = name });
+            }
+        }
+
+        if (el.TryGetProperty("parameters", out var parameters) && parameters.ValueKind == JsonValueKind.Array)
+        {
+            foreach (var p in parameters.EnumerateArray())
+            {
+                var param = new OpenApiParameter
+                {
+                    Name = p.TryGetProperty("name", out var n) ? n.GetString() : null,
+                    In = p.TryGetProperty("in", out var loc) ? ParameterLocationFrom(loc.GetString()) : null,
+                    Required = p.TryGetProperty("required", out var req) && req.GetBoolean(),
+                    Description = p.TryGetProperty("description", out var pd) ? pd.GetString() : null
+                };
+                if (p.TryGetProperty("schema", out var schema))
+                    param.Schema = ParseSchema(schema);
+                op.Parameters.Add(param);
+            }
+        }
+
+        if (el.TryGetProperty("requestBody", out var body))
+            op.RequestBody = ParseRequestBody(body);
+
+        if (el.TryGetProperty("responses", out var responses))
+        {
+            foreach (var resp in responses.EnumerateObject())
+            {
+                op.Responses[resp.Name] = new OpenApiResponse
+                {
+                    Description = resp.Value.TryGetProperty("description", out var rd)
+                        ? rd.GetString() ?? ""
+                        : ""
+                };
+            }
+        }
+
+        return op;
+    }
+
+    private static OpenApiRequestBody? ParseRequestBody(JsonElement el)
+    {
+        if (!el.TryGetProperty("content", out var content)) return null;
+        var body = new OpenApiRequestBody();
+        foreach (var ct in content.EnumerateObject())
+        {
+            var media = new OpenApiMediaType();
+            if (ct.Value.TryGetProperty("schema", out var schema))
+                media.Schema = ParseSchema(schema);
+            body.Content[ct.Name] = media;
+        }
+        return body.Content.Count > 0 ? body : null;
+    }
+
+    private static OpenApiSchema ParseSchema(JsonElement el)
+    {
+        var schema = new OpenApiSchema();
+        if (el.TryGetProperty("type", out var t)) schema.Type = t.GetString();
+        if (el.TryGetProperty("description", out var d)) schema.Description = d.GetString();
+        if (el.TryGetProperty("$ref", out var r))
+        {
+            var refId = r.GetString()?.TrimStart('#', '/');
+            if (!string.IsNullOrEmpty(refId))
+                schema.Reference = new OpenApiReference { Id = refId, Type = ReferenceType.Schema };
+        }
+        return schema;
+    }
+
+    private static ParameterLocation? ParameterLocationFrom(string? loc) => loc switch
+    {
+        "query" => ParameterLocation.Query,
+        "path" => ParameterLocation.Path,
+        "header" => ParameterLocation.Header,
+        "cookie" => ParameterLocation.Cookie,
+        _ => null
+    };
+
+    private static string? TryLoadJson()
+    {
+        foreach (var candidate in ResolveCandidatePaths())
+        {
+            try
+            {
+                if (File.Exists(candidate))
+                    return File.ReadAllText(candidate);
+            }
+            catch { /* next */ }
+        }
+        return null;
+    }
+
+    private static IEnumerable<string> ResolveCandidatePaths()
+    {
+        var roots = new[] { AppContext.BaseDirectory, Directory.GetCurrentDirectory() }
+            .Distinct(StringComparer.OrdinalIgnoreCase);
+
+        foreach (var root in roots)
+        {
+            yield return Path.GetFullPath(Path.Combine(root, "OpenApi", "simplelite-projection.json"));
+            yield return Path.GetFullPath(Path.Combine(root, "..", "..", "..", "Simple", "SimpleLite", "Docs", "openapi", "simplelite-projection.json"));
+            yield return Path.GetFullPath(Path.Combine(root, "..", "..", "Simple", "SimpleLite", "Docs", "openapi", "simplelite-projection.json"));
+        }
+    }
+}
diff --git a/MiGu.Server/Program.cs b/MiGu.Server/Program.cs
index 1cea473..312fc6f 100644
--- a/MiGu.Server/Program.cs
+++ b/MiGu.Server/Program.cs
@@ -6,6 +6,7 @@ using Microsoft.OpenApi.Models;
 using MiGu.Server.Auth;
 using MiGu.Server.Configs;
 using MiGu.Server.Launcher;
+using MiGu.Server.OpenApi;
 using Yarp.ReverseProxy.Transforms;
 
 static string? FindSourceContentRoot(string startDir)
@@ -97,7 +98,13 @@ builder.Services.AddControllers()
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen(c =>
 {
-    c.SwaggerDoc("v1", new() { Title = "MiGu.Server", Version = "v1", Description = "Simple-FR 平台后端骨架（含 YARP 反代 SimpleLite 8222）。" });
+    c.SwaggerDoc("v1", new()
+    {
+        Title = "MiGu.Server + SimpleLite",
+        Version = "v1",
+        Description = "咪咕平台后端 API，以及经 YARP 反代的 SimpleLite 数据 WebApi（标签 SimpleLite/*）。详见 Simple/SimpleLite/Docs/MIGU-API.md。"
+    });
+    c.DocumentFilter<SimpleLiteOpenApiDocumentFilter>();
     // Swagger 里挂 Bearer 输入框，便于手工测带鉴权的端点。
     c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
     {