diff --git a/src/DatabaseServices/Lights/DirectionalLight.ts b/src/DatabaseServices/Lights/DirectionalLight.ts
index fc119f624..237ba87cd 100644
--- a/src/DatabaseServices/Lights/DirectionalLight.ts
+++ b/src/DatabaseServices/Lights/DirectionalLight.ts
@@ -1,4 +1,4 @@
-import { DirectionalLight as TDirectionalLight, Group, MathUtils, Matrix3, Matrix4, Object3D, Vector2, Vector3 } from "three";
+import { Group, MathUtils, Matrix3, Matrix4, Object3D, DirectionalLight as TDirectionalLight, Vector2, Vector3 } from "three";
 import { UpdateDraw } from "../../Common/Status";
 import { equaln, equalv3 } from "../../Geometry/GeUtils";
 import { RenderType } from "../../GraphicsSystem/RenderType";
@@ -16,7 +16,7 @@ export class DirectionalLight extends Light
 {
     protected _Intensity: number = 50; //强度
     //光源源角度 0-50
-    @AutoRecord LightSourceAngle = 0.5357;
+    @AutoRecord LightSourceAngle = 0.5;
     //源软角度角度
     @AutoRecord LightSourceSoftAngle = 0;
 
diff --git a/src/UI/Components/RightPanel/RightPanel.less b/src/UI/Components/RightPanel/RightPanel.less
index 968565ca2..cb63b24a5 100644
--- a/src/UI/Components/RightPanel/RightPanel.less
+++ b/src/UI/Components/RightPanel/RightPanel.less
@@ -208,7 +208,11 @@
                 margin-left: auto;
             }
 
-            :nth-child(2) {
+            > :nth-child(1) {
+                margin: 0;
+            }
+
+            > :nth-child(2) {
                 margin: 0;
             }
         }
diff --git a/src/UI/Components/RightPanel/SunLightGui.tsx b/src/UI/Components/RightPanel/SunLightGui.tsx
index 4a6191eb0..cff12f78b 100644
--- a/src/UI/Components/RightPanel/SunLightGui.tsx
+++ b/src/UI/Components/RightPanel/SunLightGui.tsx
@@ -416,7 +416,12 @@ export default class SunLightGui extends Component
                 </FormGroup>
                 <FormGroup>
                     <div className='sun-light-angle'>
-                        <Label>源角:</Label>
+                        <Tooltip
+                            content="定向光源的自发光表面相对于接收物而延展的角度，影响半影尺寸"
+                            position='top-left'
+                        >
+                            <Label>源角:</Label>
+                        </Tooltip>
                         <INumericInput
                             min={0}
                             max={5}
@@ -443,7 +448,7 @@ export default class SunLightGui extends Component
                             value={this.store.sunLightSourceAngle}
                             onChange={async (val) =>
                             {
-                                let v = parseFloat(FixedNotZero(val, 4));
+                                let v = parseFloat(FixedNotZero(val, 1));
                                 await this.SetSunLightSourceAngle(v);
                                 app.Viewer.UpdateRender();
                             }}
@@ -465,7 +470,7 @@ export default class SunLightGui extends Component
                                 icon='redo'
                                 onClick={async () =>
                                 {
-                                    await this.SetSunLightSourceAngle(0.5357);
+                                    await this.SetSunLightSourceAngle(0.5);
                                     app.Viewer.UpdateRender();
                                     const KEY = '修改太阳光源角度';
                                     if (CommandState.CommandIng && app.Database.hm.UndoData.CommandName === KEY)
diff --git a/src/UI/Components/RightPanel/SunLightStore.ts b/src/UI/Components/RightPanel/SunLightStore.ts
index 83de5605b..0e781e674 100644
--- a/src/UI/Components/RightPanel/SunLightStore.ts
+++ b/src/UI/Components/RightPanel/SunLightStore.ts
@@ -71,6 +71,7 @@ export class SunLightStore
         this.sunLightIndirectLightingIntensity = light.IndirectLightingIntensity;
         this.sunLightColorTemperature = light.Temperature;
         this.sunLightColor = `#${light.Color.getHexString()}`;
+        this.sunLightSourceAngle = light.LightSourceAngle;
 
         let rotateV = light.Position.sub(light.Target).normalize();
         let theta = Math.atan2(rotateV.y, rotateV.x) * MathUtils.RAD2DEG;//旋转