diff --git a/src/core/model/ColorScale.cpp b/src/core/model/ColorScale.cpp
index 62eb2ef..dce6ad6 100644
--- a/src/core/model/ColorScale.cpp
+++ b/src/core/model/ColorScale.cpp
@@ -33,6 +33,13 @@ void ColorScale::addStop(double value, Rgba color) {
               [](const Stop& x, const Stop& y) { return x.value < y.value; });
 }
 
+std::vector<double> ColorScale::stopValues() const {
+    std::vector<double> v;
+    v.reserve(stops_.size());
+    for (const auto& s : stops_) v.push_back(s.value);  // stops_ 已升序
+    return v;
+}
+
 Rgba ColorScale::colorAt(double value) const {
     if (std::isnan(value)) return nan_.value_or(Rgba{0, 0, 0, 0});
     if (stops_.empty()) return Rgba{0, 0, 0, 0};
diff --git a/src/core/model/ColorScale.hpp b/src/core/model/ColorScale.hpp
index c744162..b859478 100644
--- a/src/core/model/ColorScale.hpp
+++ b/src/core/model/ColorScale.hpp
@@ -14,6 +14,8 @@ class ColorScale {
 public:
     void addStop(double value, Rgba color);  // 内部保持按 value 升序
     Rgba colorAt(double value) const;        // 含 under/over/NaN 处理
+    std::vector<double> stopValues() const;  // 升序分段值（供等值线用真实非均匀级）
+    std::size_t stopCount() const { return stops_.size(); }
     void setUnder(Rgba c) { under_ = c; }
     void setOver(Rgba c)  { over_ = c; }
     void setNan(Rgba c)   { nan_ = c; }
diff --git a/src/render/actors/GridContourActor.cpp b/src/render/actors/GridContourActor.cpp
index 15def7b..2eec1cb 100644
--- a/src/render/actors/GridContourActor.cpp
+++ b/src/render/actors/GridContourActor.cpp
@@ -50,17 +50,19 @@ GridActors buildGridContour(const geopro::core::Grid& g, const geopro::core::Col
     sgrid->SetPoints(points);
     sgrid->GetPointData()->SetScalars(sc);
 
-    // vmin/vmax 来自 Grid；若退化（==）则用数据极值兜底，避免 LUT/contour 退化。
-    double vmin = g.vmin, vmax = g.vmax;
-    if (vmin >= vmax) {
-        const auto& vals = g.values();
-        vmin = vals.empty() ? 0.0 : vals.front();
-        vmax = vmin;
-        for (double v : vals) {
-            if (v < vmin) vmin = v;
-            if (v > vmax) vmax = v;
+    // 等值线级用 colorBar 的**真实非均匀分段值**(电阻率低值密集)，而非均匀分级——
+    // 否则数据全挤进低端、一片蓝。范围/色阶都以 colorBar 为准。
+    const std::vector<double> stops = cs.stopValues();
+    double vmin, vmax;
+    if (stops.size() >= 2) { vmin = stops.front(); vmax = stops.back(); }
+    else {
+        vmin = g.vmin; vmax = g.vmax;
+        if (vmin >= vmax) {
+            const auto& vals = g.values();
+            vmin = vals.empty() ? 0.0 : vals.front(); vmax = vmin;
+            for (double v : vals) { if (v < vmin) vmin = v; if (v > vmax) vmax = v; }
+            if (vmin >= vmax) vmax = vmin + 1.0;
         }
-        if (vmin >= vmax) vmax = vmin + 1.0;
     }
 
     auto lut = buildLut(cs, vmin, vmax, kLutLevels);
@@ -70,7 +72,12 @@ GridActors buildGridContour(const geopro::core::Grid& g, const geopro::core::Col
 
     vtkNew<vtkBandedPolyDataContourFilter> banded;
     banded->SetInputConnection(surf->GetOutputPort());
-    banded->GenerateValues(kBandCount, vmin, vmax);
+    if (stops.size() >= 2) {
+        banded->SetNumberOfContours(static_cast<int>(stops.size()));
+        for (int i = 0; i < static_cast<int>(stops.size()); ++i) banded->SetValue(i, stops[i]);
+    } else {
+        banded->GenerateValues(kBandCount, vmin, vmax);
+    }
     banded->GenerateContourEdgesOn();
     banded->SetScalarModeToValue();
 
diff --git a/tests/spike/render_verify.cpp b/tests/spike/render_verify.cpp
index 69c1779..c5f0bb4 100644
--- a/tests/spike/render_verify.cpp
+++ b/tests/spike/render_verify.cpp
@@ -1,12 +1,12 @@
 // 离屏渲染验证：把真实数据渲成 PNG，肉眼核对方向/2D-3D 差异(不靠"进程活着"自欺)。
 // 产出(D:/dev/spike_data/):
-//   verify_section.png  —— 平面反演剖面(#18, 数据详情),应浅部在上、深部在下
-//   verify_curtain_top.png —— 帘面俯视(二维),应看到一条沿测线的带(像地图线)
-//   verify_curtain_3d.png  —— 帘面透视(三维),应看到立着的彩色断面墙
+//   verify_section.png      —— 平面反演剖面(#18, 数据详情), 浅部在上、深部在下, 纵向夸张填满
+//   verify_curtain_top.png  —— 帘面俯视(二维)
+//   verify_curtain_3d.png   —— 帘面透视(三维)
 #include <fstream>
+#include <numeric>
 #include <sstream>
 #include <string>
-#include <numeric>
 
 #include <vtkActor.h>
 #include <vtkNew.h>
@@ -15,12 +15,12 @@
 #include <vtkRenderer.h>
 #include <vtkWindowToImageFilter.h>
 
-#include "parse/SampleParsers.hpp"
-#include "geo/GeoLocalFrame.hpp"
-#include "actors/GridContourActor.hpp"
-#include "actors/CurtainActor.hpp"
-#include "ColorLutBuilder.hpp"
 #include "CameraPreset.hpp"
+#include "ColorLutBuilder.hpp"
+#include "actors/CurtainActor.hpp"
+#include "actors/GridContourActor.hpp"
+#include "geo/GeoLocalFrame.hpp"
+#include "parse/SampleParsers.hpp"
 
 static std::string slurp(const char* p) {
     std::ifstream f(p);
@@ -44,17 +44,18 @@ int main() {
     core::Grid g = data::parseGrid(slurp((dir + "grid.json").c_str()));
     core::ColorScale cs = data::parseColorScale(slurp((dir + "colorbar.json").c_str()));
 
-    // 1) 平面剖面 (#18) — 俯视看 XY 平面(face-on)
+    // 1) 平面剖面 (#18) — 俯视看 XY 平面(face-on); 纵向夸张 1.5x 填满宽面板(物探惯例)
     {
         auto a = render::buildGridContour(g, cs);
+        const double exag = 1.5;
         vtkNew<vtkRenderer> ren; ren->SetBackground(1, 1, 1);
-        if (a.bands) ren->AddActor(a.bands);
-        if (a.edges) ren->AddActor(a.edges);
+        if (a.bands) { a.bands->SetScale(1.0, exag, 1.0); ren->AddActor(a.bands); }
+        if (a.edges) { a.edges->SetScale(1.0, exag, 1.0); ren->AddActor(a.edges); }
         render::applyTop2D(ren);
-        renderToPng(ren, (dir + "verify_section.png").c_str(), 1100, 320);
+        renderToPng(ren, (dir + "verify_section.png").c_str(), 1100, 360);
     }
 
-    // GeoLocalFrame：原点取 lat/lon 均值
+    // GeoLocalFrame: 原点取 lat/lon 均值
     double lat0 = std::accumulate(g.lat.begin(), g.lat.end(), 0.0) / (g.lat.empty() ? 1 : g.lat.size());
     double lon0 = std::accumulate(g.lon.begin(), g.lon.end(), 0.0) / (g.lon.empty() ? 1 : g.lon.size());
     core::GeoLocalFrame frame(lat0, lon0);