diff --git a/src/Shentun.Peis.Domain/RegisterCheckItems/RegisterCheckItemManager.cs b/src/Shentun.Peis.Domain/RegisterCheckItems/RegisterCheckItemManager.cs
index 53a74da..c4b7fbd 100644
--- a/src/Shentun.Peis.Domain/RegisterCheckItems/RegisterCheckItemManager.cs
+++ b/src/Shentun.Peis.Domain/RegisterCheckItems/RegisterCheckItemManager.cs
@@ -197,7 +197,7 @@ namespace Shentun.Peis.RegisterCheckItems
 
             pos = referenceRangeValue.IndexOf(">=");
             var charLength = ">=".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：>=
                 lowReferenceRangeValueStr = referenceRangeValue.Substring(pos + charLength);
@@ -215,7 +215,7 @@ namespace Shentun.Peis.RegisterCheckItems
 
             pos = referenceRangeValue.IndexOf(">");
             charLength = ">".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：>
                 lowReferenceRangeValueStr = referenceRangeValue.Substring(pos + charLength);
@@ -233,7 +233,7 @@ namespace Shentun.Peis.RegisterCheckItems
 
             pos = referenceRangeValue.IndexOf("<=");
             charLength = "<=".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：<=
                 hegihtReferenceRangeValueStr = referenceRangeValue.Substring(pos + charLength);
@@ -250,7 +250,7 @@ namespace Shentun.Peis.RegisterCheckItems
             }
             pos = referenceRangeValue.IndexOf("<");
             charLength = "<".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：<
                 hegihtReferenceRangeValueStr = referenceRangeValue.Substring(pos + charLength);
@@ -321,7 +321,7 @@ namespace Shentun.Peis.RegisterCheckItems
 
             pos = criticalRangeValue.IndexOf(">=");
             var charLength = ">=".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：>=
                 lowReferenceRangeValueStr = criticalRangeValue.Substring(pos + charLength);
@@ -339,7 +339,7 @@ namespace Shentun.Peis.RegisterCheckItems
 
             pos = criticalRangeValue.IndexOf(">");
             charLength = ">".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：>
                 lowReferenceRangeValueStr = criticalRangeValue.Substring(pos + charLength);
@@ -357,7 +357,7 @@ namespace Shentun.Peis.RegisterCheckItems
 
             pos = criticalRangeValue.IndexOf("<=");
             charLength = "<=".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：<=
                 hegihtReferenceRangeValueStr = criticalRangeValue.Substring(pos + charLength);
@@ -374,7 +374,7 @@ namespace Shentun.Peis.RegisterCheckItems
             }
             pos = criticalRangeValue.IndexOf("<");
             charLength = "<".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：<
                 hegihtReferenceRangeValueStr = criticalRangeValue.Substring(pos + charLength);
@@ -446,7 +446,7 @@ namespace Shentun.Peis.RegisterCheckItems
 
             pos = followUpRangeValue.IndexOf(">=");
             var charLength = ">=".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：>=
                 lowReferenceRangeValueStr = followUpRangeValue.Substring(pos + charLength);
@@ -464,7 +464,7 @@ namespace Shentun.Peis.RegisterCheckItems
 
             pos = followUpRangeValue.IndexOf(">");
             charLength = ">".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：>
                 lowReferenceRangeValueStr = followUpRangeValue.Substring(pos + charLength);
@@ -482,7 +482,7 @@ namespace Shentun.Peis.RegisterCheckItems
 
             pos = followUpRangeValue.IndexOf("<=");
             charLength = "<=".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：<=
                 hegihtReferenceRangeValueStr = followUpRangeValue.Substring(pos + charLength);
@@ -499,7 +499,7 @@ namespace Shentun.Peis.RegisterCheckItems
             }
             pos = followUpRangeValue.IndexOf("<");
             charLength = "<".Length;
-            if (pos > 0)
+            if (pos == 0)
             {
                 //参考范围形式：<
                 hegihtReferenceRangeValueStr = followUpRangeValue.Substring(pos + charLength);