diff --git a/AyCode.Core/Serializers/Binaries/BinaryPropertyAccessorBase.cs b/AyCode.Core/Serializers/Binaries/BinaryPropertyAccessorBase.cs
index 15c653c..b68b09a 100644
--- a/AyCode.Core/Serializers/Binaries/BinaryPropertyAccessorBase.cs
+++ b/AyCode.Core/Serializers/Binaries/BinaryPropertyAccessorBase.cs
@@ -7,7 +7,7 @@ namespace AyCode.Core.Serializers.Binaries;
 /// <summary>
 /// Binary-specific property accessor.
 /// Inherits typed getters from PropertyAccessorBase.
-/// Adds Binary-specific property: PropertyIndex.
+/// Adds Binary-specific properties: PropertyIndex, IsStringInternProperty.
 /// </summary>
 public abstract class BinaryPropertyAccessorBase : PropertyAccessorBase
 {
@@ -18,14 +18,26 @@ public abstract class BinaryPropertyAccessorBase : PropertyAccessorBase
     /// </summary>
     public int PropertyIndex { get; internal set; } = -1;
 
+    /// <summary>
+    /// Cached string intern attribute value for this property.
+    /// null = no attribute (use global StringInterningMode setting)
+    /// true = [AcStringIntern(true)] - always intern
+    /// false = [AcStringIntern(false)] - never intern
+    /// </summary>
+    public bool? IsStringInternProperty { get; }
+
     /// <summary>
     /// Object getter for property filter context.
     /// </summary>
     public Func<object, object?> DynamicGetter => _dynamicGetter;
 
-    protected BinaryPropertyAccessorBase(PropertyInfo prop, Type declaringType) 
+    protected BinaryPropertyAccessorBase(PropertyInfo prop, Type declaringType)
         : base(prop, declaringType)
     {
         // All typed getters are initialized in PropertyAccessorBase
+
+        // Cache string intern attribute (inherit: true to check base class properties)
+        var attr = prop.GetCustomAttribute<AcStringInternAttribute>(inherit: true);
+        IsStringInternProperty = attr?.Enabled;
     }
 }