diff --git a/BasePlatformDotnet/Directory.Build.props b/BasePlatformDotnet/Directory.Build.props
index cbddf3c..7f4befe 100644
--- a/BasePlatformDotnet/Directory.Build.props
+++ b/BasePlatformDotnet/Directory.Build.props
@@ -10,8 +10,9 @@
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <IsPackable>true</IsPackable>
     <!-- 包版本统一随 YhPlatformNetVersion 走（对齐 BOM 集中钉版本）
-         1.0.0-preview.1：核对表 #6~#9/#12 未实调，先发预发布；实调通过再定 1.0.0 -->
-    <YhPlatformNetVersion>1.0.0-preview.1</YhPlatformNetVersion>
+         1.0.0-preview.1：核对表 #6~#9/#12 未实调，先发预发布；实调通过再定 1.0.0
+         1.0.0-preview.2：Yh.SchClass.OpenApi 新增 SchTree（/oapi/SchGroup/GetTeaTree 教师组树） -->
+    <YhPlatformNetVersion>1.0.0-preview.2</YhPlatformNetVersion>
     <Version>$(YhPlatformNetVersion)</Version>
     <Authors>yunhai-platform</Authors>
     <Company>yunhai</Company>
diff --git a/BasePlatformDotnet/src/Yh.SchClass.OpenApi/Model/TeaTreeVo.cs b/BasePlatformDotnet/src/Yh.SchClass.OpenApi/Model/TeaTreeVo.cs
new file mode 100644
index 0000000..68fe77a
--- /dev/null
+++ b/BasePlatformDotnet/src/Yh.SchClass.OpenApi/Model/TeaTreeVo.cs
@@ -0,0 +1,37 @@
+using System.Text.Json.Serialization;
+
+namespace Yh.SchClass.OpenApi.Model;
+
+/// <summary>
+/// 学校教师组树节点视图对象（镜像 Java <c>com.yunhai.bschclassmanage.model.oa.TeaTreeVO</c>）。
+/// <para>
+/// Java 侧为 Lombok <c>@Data</c> + <c>@JsonInclude(NON_NULL)</c>：教师叶子节点的
+/// <c>children</c> 为 null 会被省略；本客户端大小写不敏感反序列化，按 Java 字段原名锚定即可双向兼容。
+/// </para>
+/// </summary>
+public class TeaTreeVo
+{
+    /// <summary>节点 ID（学校/组为组中心 ID，教师为 teaId，未分组兜底节点为 -1）</summary>
+    [JsonPropertyName("id")] public int? Id { get; set; }
+
+    /// <summary>节点名称</summary>
+    [JsonPropertyName("name")] public string? Name { get; set; }
+
+    /// <summary>父节点 ID（根节点为 0）</summary>
+    [JsonPropertyName("pid")] public int? Pid { get; set; }
+
+    /// <summary>排序号（组=组中心 sort，教师=0）</summary>
+    [JsonPropertyName("no")] public int? No { get; set; }
+
+    /// <summary>节点类型（1=组节点，2=教师叶子）</summary>
+    [JsonPropertyName("type")] public int? Type { get; set; }
+
+    /// <summary>是否父节点（组=true，教师=false）</summary>
+    [JsonPropertyName("isParent")] public bool? IsParent { get; set; }
+
+    /// <summary>头像（Java 侧固定空串）</summary>
+    [JsonPropertyName("photo")] public string? Photo { get; set; }
+
+    /// <summary>子节点（组节点保证非 null；教师叶子为 null）</summary>
+    [JsonPropertyName("children")] public List<TeaTreeVo>? Children { get; set; }
+}
diff --git a/BasePlatformDotnet/src/Yh.SchClass.OpenApi/SchClassSchTreeClient.cs b/BasePlatformDotnet/src/Yh.SchClass.OpenApi/SchClassSchTreeClient.cs
new file mode 100644
index 0000000..ee30945
--- /dev/null
+++ b/BasePlatformDotnet/src/Yh.SchClass.OpenApi/SchClassSchTreeClient.cs
@@ -0,0 +1,28 @@
+using Yh.SchClass.OpenApi.Model;
+
+namespace Yh.SchClass.OpenApi;
+
+/// <summary>
+/// 学校教师组树客户端（镜像 Java <c>SchGroupController</c>，路径前缀 <c>/oapi/SchGroup/</c>）。
+/// </summary>
+public class SchClassSchTreeClient : SchClassClientBase
+{
+    private const string Root = Prefix + "/SchGroup/";
+
+    public SchClassSchTreeClient(HttpClient httpClient, SchClassOpenApiOptions options)
+        : base(httpClient, options)
+    {
+    }
+
+    /// <summary>
+    /// 获取学校教师组树（<c>GET /oapi/SchGroup/GetTeaTree</c>）。
+    /// 返回单元素数组（根 = 学校节点，type=1），其下为教师组层级挂教师叶子（type=2）。
+    /// <paramref name="schId"/> 与 <paramref name="schSerId"/> 至少提供一个（服务端 schId 优先），
+    /// 都缺时服务端返回空数组（本方法返回空列表，与 Java 行为一致）。
+    /// </summary>
+    /// <param name="schSerId">学校外部序列号（Java 参数名 <c>SchSerID</c>）。</param>
+    /// <param name="schId">学校内部 ID（Java 参数名 <c>schId</c>，优先使用）。</param>
+    public Task<List<TeaTreeVo>> GetTeaTreeAsync(string? schSerId = null, int? schId = null, CancellationToken ct = default)
+        => ResolveListAsync<TeaTreeVo>(HttpMethod.Get, Root + "GetTeaTree",
+            Params(("SchSerID", schSerId), ("schId", schId)), ct: ct);
+}
diff --git a/BasePlatformDotnet/tests/Yh.SchClass.OpenApi.Tests/SchClassSchTreeClientTests.cs b/BasePlatformDotnet/tests/Yh.SchClass.OpenApi.Tests/SchClassSchTreeClientTests.cs
new file mode 100644
index 0000000..f6457d6
--- /dev/null
+++ b/BasePlatformDotnet/tests/Yh.SchClass.OpenApi.Tests/SchClassSchTreeClientTests.cs
@@ -0,0 +1,101 @@
+namespace Yh.SchClass.OpenApi.Tests;
+
+/// <summary>SchTree（教师组树）端点契约与 <see cref="TeaTreeVo"/> 反序列化。</summary>
+public class SchClassSchTreeClientTests
+{
+    private const string Root = "/oapi/SchGroup/";
+
+    [Fact]
+    public async Task SchGroup_GetTeaTree_路径与参数名对齐()
+    {
+        var handler = SchClassTestHost.Ok();
+        var api = SchClassTestHost.Api(handler);
+
+        // 双参数齐全：按 Java 参数原名 SchSerID / schId 提交
+        await api.SchTree.GetTeaTreeAsync("S1", 2);
+        SchClassTestHost.Verify(handler, HttpMethod.Get, Root + "GetTeaTree", "?SchSerID=S1&schId=2");
+
+        // 仅 schId（服务端优先使用）
+        await api.SchTree.GetTeaTreeAsync(null, 5);
+        SchClassTestHost.Verify(handler, HttpMethod.Get, Root + "GetTeaTree", "?schId=5");
+
+        // 仅 SchSerID
+        await api.SchTree.GetTeaTreeAsync("S9", null);
+        SchClassTestHost.Verify(handler, HttpMethod.Get, Root + "GetTeaTree", "?SchSerID=S9");
+
+        // 都缺：服务端返回 []（不抛异常）
+        await api.SchTree.GetTeaTreeAsync();
+        SchClassTestHost.Verify(handler, HttpMethod.Get, Root + "GetTeaTree", "");
+    }
+
+    [Fact]
+    public async Task TeaTreeVO_嵌套树按Java原名反序列化()
+    {
+        // 教师叶子节点无 children 字段（Java @JsonInclude(NON_NULL) 省略）
+        var handler = FakeHandler.Json(HttpStatusCode.OK, """
+        [{"id":10,"name":"第一中学","pid":0,"no":1,"type":1,"isParent":true,"photo":"",
+          "children":[
+            {"id":31,"name":"教师组","pid":10,"no":1,"type":1,"isParent":true,"photo":"",
+             "children":[
+               {"id":32,"name":"语文组","pid":31,"no":1,"type":1,"isParent":true,"photo":"",
+                "children":[
+                  {"id":77,"name":"王老师","pid":32,"no":0,"type":2,"isParent":false,"photo":""}]},
+               {"id":99,"name":"李老师","pid":31,"no":0,"type":2,"isParent":false,"photo":""}]}]}]
+        """);
+
+        var tree = await SchClassTestHost.Api(handler).SchTree.GetTeaTreeAsync("S001", null);
+
+        Assert.Single(tree);
+        var sch = tree[0];
+        Assert.Equal(10, sch.Id);
+        Assert.Equal("第一中学", sch.Name);
+        Assert.Equal(0, sch.Pid);
+        Assert.Equal(1, sch.Type);
+        Assert.True(sch.IsParent);
+        Assert.Equal("", sch.Photo);
+
+        var teaGroup = Assert.Single(sch.Children!);
+        Assert.Equal(31, teaGroup.Id);
+        Assert.Equal("教师组", teaGroup.Name);
+        Assert.Equal(10, teaGroup.Pid);
+
+        Assert.Equal(2, teaGroup.Children!.Count);
+        var subject = teaGroup.Children[0];
+        Assert.Equal("语文组", subject.Name);
+        var tea = Assert.Single(subject.Children!);
+        Assert.Equal(77, tea.Id);
+        Assert.Equal("王老师", tea.Name);
+        Assert.Equal(32, tea.Pid);
+        Assert.Equal(0, tea.No);
+        Assert.Equal(2, tea.Type);
+        Assert.False(tea.IsParent);
+        Assert.Null(tea.Children);
+
+        var ungrouped = teaGroup.Children[1];
+        Assert.Equal(99, ungrouped.Id);
+        Assert.Equal("李老师", ungrouped.Name);
+        Assert.Null(ungrouped.Children);
+    }
+
+    [Fact]
+    public async Task GetTeaTree_两参数都缺时服务端空数组返回空列表()
+    {
+        var handler = FakeHandler.Json(HttpStatusCode.OK, "[]");
+
+        var tree = await SchClassTestHost.Api(handler).SchTree.GetTeaTreeAsync();
+
+        Assert.NotNull(tree);
+        Assert.Empty(tree);
+    }
+
+    [Fact]
+    public async Task GetTeaTree_服务端404时归一为空列表()
+    {
+        var handler = FakeHandler.Empty(HttpStatusCode.NotFound);
+
+        var tree = await SchClassTestHost.Api(handler).SchTree.GetTeaTreeAsync("S001", null);
+
+        Assert.NotNull(tree);
+        Assert.Empty(tree);
+    }
+}
diff --git a/yh-platform-dotnet建设方案v4.md b/yh-platform-dotnet建设方案v4.md
index 9ab204c..052c0a5 100644
--- a/yh-platform-dotnet建设方案v4.md
+++ b/yh-platform-dotnet建设方案v4.md
@@ -245,7 +245,7 @@ dotnet pack -c Release -o artifacts   # 预期 4 包生成
 | 模型契约 | ✅ 13 POCO ⇔ 权威快照双向对拍 |
 | 双序列化器 | ✅ Newtonsoft（大小写不敏感）+ STJ Web 逐节点对拍 |
 | pack 产物 | ✅ 5 包（含 Yh.SchClass.OpenApi）、双 TFM lib、依赖分组正确（本地验证） |
-| Nexus 发布 | ✅ 5 包 1.0.0-preview.1 已推送（2026-09-02）；CI #643 全绿自动发布链路打通 |
+| Nexus 发布 | ✅ 5 包 1.0.0-preview.1 已推送（2026-09-02）；CI #643 全绿自动发布链路打通；1.0.0-preview.2 增补 Yh.SchClass.OpenApi SchTree 教师组树（2026-09-08） |
 | 真实环境实调 | ❌ 待 UserBase 测试环境（待 4.2，核对表 15 项中 11 过 4 待） |
 | 消费方实际接入 | ❌ 未开始（待 4.3 指南 + 4.1 发布） |