diff --git a/viewpanel/run.sh b/viewpanel/run.sh
index bfc7032..2f2253e 100755
--- a/viewpanel/run.sh
+++ b/viewpanel/run.sh
@@ -37,6 +37,7 @@ cmd = [jx,
        "-Dspine.payload=" + pay,
        "-Dspine.resources=" + here + "/resources",
        "-Dspine.compat=" + here + "/compat-classes",
+       "-Dpanel.h=" + (os.environ.get("PANEL_H") or "984"),
        "-Dspine.classes=" + here + "/build/classes",
        "-Duser.home=" + root + "/spine-lab/home",
        "-cp", here + "/build/classes:" + root + "/tools/asm/asm.jar:" + root + "/tools/asm/asm-tree.jar",
diff --git a/viewpanel/src/com/spineview/ObjectPanel.java b/viewpanel/src/com/spineview/ObjectPanel.java
index 3603c4b..1d4fe06 100644
--- a/viewpanel/src/com/spineview/ObjectPanel.java
+++ b/viewpanel/src/com/spineview/ObjectPanel.java
@@ -135,6 +135,7 @@ public final class ObjectPanel {
     // 上段：按钮块（自适应高度，紧贴顶部）
     Object cell = call(root, Obf.TABLE_ADD, new Class<?>[] {actorClass}, cellClass, buttons);
     layoutCell(cell, Obf.CELL_LEFT, Obf.CELL_FILL_X);
+    final Object buttonsCell = cell;
     call(root, Obf.TABLE_ROW, new Class<?>[0], cellClass);
     // 上/中/下 = 根表格的**三个单元格**（这样 setDebug 画出来就是三条带）：
     //   上 = 按钮块（已经在上面加过）
@@ -215,47 +216,20 @@ public final class ObjectPanel {
     } catch (Throwable error) {
       System.err.println("[panel] 开启描边失败: " + error);
     }
-    // 中段高度 = **父容器（停靠框）高度** − 按钮段 − 日志段（不用 expand）。
-    // 父容器：根表格的 getParent()（载荷里是"无参、返回 Actor/Group 类型"的那个方法）。
-    Thread fit = new Thread(new Runnable() {
-      @Override
-      public void run() {
-        try {
-          Object parent = null;
-          for (Method m : state.root.getClass().getMethods()) {
-            if (m.getParameterTypes().length != 0) continue;
-            String ret = m.getReturnType().getName();
-            if (!ret.equals(Obf.ACTOR) && !ret.equals(Obf.GROUP)) continue;
-            m.setAccessible(true);
-            Object value = m.invoke(state.root);
-            if (value != null) {
-              parent = value;
-              System.err.println("[panel] 面板父容器 = " + value.getClass().getName()
-                  + " via " + m.getDeclaringClass().getName() + "." + m.getName());
-              break;
-            }
-          }
-          for (int pass = 0; pass < 3; pass++) {
-            Thread.sleep(500);
-            float dockHeight = parent == null ? floatOf(state.root, "init") : floatOf(parent, "init");
-            float buttonsHeight = floatOf(state.buttons, "init");
-            float logHeight = floatOf(state.status, "init");
-            float middle = dockHeight - buttonsHeight - logHeight - 12f;
-            if (middle < 120f) middle = 120f;
-            call(state.listCell, "I", new Class<?>[] {float.class}, state.cellClass,
-                Float.valueOf(middle));
-            call(state.root, "b_", new Class<?>[0], void.class);
-            call(state.listScroll, "b_", new Class<?>[0], void.class);
-            System.err.println("[panel] pass" + pass + " dock=" + dockHeight + " buttons="
-                + buttonsHeight + " log=" + logHeight + " -> middle=" + middle);
-          }
-        } catch (Throwable error) {
-          System.err.println("[panel] 自适应中段高度失败: " + error);
-        }
-      }
-    }, "spineview-fit-middle");
-    fit.setDaemon(true);
-    fit.start();
+    // 三段高度按用户要求：上 20% / 中 60% / 下 20%（不用 expand）。
+    // 面板高度取实测值 984（见日志 pass0 dock=984），换算 = 197 / 590 / 197。
+    // 面板高度：默认取实测值 984（本机逻辑高度），可用 -Dpanel.h=<像素> 覆盖（4K/不同窗口大小用）。
+    final float PANEL_H = Float.parseFloat(System.getProperty("panel.h", "984"));
+    try {
+      call(buttonsCell, "I", new Class<?>[] {float.class}, cellClass,
+          Float.valueOf(PANEL_H * 0.20f));
+      call(cell, "I", new Class<?>[] {float.class}, cellClass, Float.valueOf(PANEL_H * 0.60f));
+      call(logCell, "I", new Class<?>[] {float.class}, cellClass, Float.valueOf(PANEL_H * 0.20f));
+      System.err.println("[panel] 三段高度: " + (PANEL_H * 0.20f) + " / " + (PANEL_H * 0.60f)
+          + " / " + (PANEL_H * 0.20f));
+    } catch (Throwable error) {
+      System.err.println("[panel] 设置三段高度失败: " + error);
+    }
     System.err.println("[panel] 增删改查面板已建好");
     refreshList(state);
     return root;