diff --git a/src/Cap.Consistency/Infrastructure/ConsistencyMessage.cs b/src/Cap.Consistency/Infrastructure/ConsistencyMessage.cs
new file mode 100644
index 0000000..edd8d97
--- /dev/null
+++ b/src/Cap.Consistency/Infrastructure/ConsistencyMessage.cs
@@ -0,0 +1,51 @@
+using System;
+
+namespace Cap.Consistency.Infrastructure
+{
+    /// <summary>
+    /// The default implementation of <see cref="ConsistencyMessage{TKey}"/> which uses a string as a primary key.
+    /// </summary>
+    public class ConsistencyMessage : ConsistencyMessage<string>
+    {
+        /// <summary>
+        /// Initializes a new instance of <see cref="ConsistencyMessage"/>.
+        /// </summary>
+        /// <remarks>
+        /// The Id property is initialized to from a new GUID string value.
+        /// </remarks>
+        public ConsistencyMessage() {
+            Id = Guid.NewGuid().ToString();
+            SendTime = DateTime.Now;
+            UpdateTime = SendTime;
+            Status = MessageStatus.WaitForSend;
+        }
+    }
+
+    /// <summary>
+    /// ConsistencyMessage consume status
+    /// </summary>
+    public enum MessageStatus
+    {
+        Deleted = 0,
+        WaitForSend = 1,
+        RollbackSuccessed = 3,
+        RollbackFailed = 4
+    }
+
+    /// <summary>
+    /// Represents a message in the consistency system
+    /// </summary>
+    /// <typeparam name="TKey">The type used for the primary key for the message.</typeparam>
+    public class ConsistencyMessage<TKey> where TKey : IEquatable<TKey>
+    {
+        public virtual TKey Id { get; set; }
+
+        public virtual DateTime SendTime { get; set; }
+
+        public string Payload { get; set; }
+
+        public MessageStatus Status { get; set; }
+
+        public virtual DateTime? UpdateTime { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/src/Cap.Consistency/Infrastructure/DeliverMessage.cs b/src/Cap.Consistency/Infrastructure/DeliverMessage.cs
index 28ab90e..af4072e 100644
--- a/src/Cap.Consistency/Infrastructure/DeliverMessage.cs
+++ b/src/Cap.Consistency/Infrastructure/DeliverMessage.cs
@@ -16,6 +16,8 @@ namespace Cap.Consistency.Infrastructure
 
 
         public byte[] Body { get; set; }
+
+        public string Value { get; set; }
     }
 
 
@@ -27,6 +29,5 @@ namespace Cap.Consistency.Infrastructure
         public long Offset { get; set; }
 
         public string MessageId { get; set; }
-
     }
 }
diff --git a/src/Cap.Consistency/Infrastructure/IConsumerExcutorSelector.cs b/src/Cap.Consistency/Infrastructure/IConsumerExcutorSelector.cs
index 714a955..a8bf4bb 100644
--- a/src/Cap.Consistency/Infrastructure/IConsumerExcutorSelector.cs
+++ b/src/Cap.Consistency/Infrastructure/IConsumerExcutorSelector.cs
@@ -10,6 +10,6 @@ namespace Cap.Consistency.Infrastructure
     {
         IReadOnlyList<ConsumerExecutorDescriptor> SelectCandidates(TopicRouteContext context);
 
-        ConsumerExecutorDescriptor SelectBestCandidate(TopicRouteContext context, IReadOnlyList<ConsumerExecutorDescriptor> executeDescriptor);
+        ConsumerExecutorDescriptor SelectBestCandidate(string key, IReadOnlyList<ConsumerExecutorDescriptor> executeDescriptor);
     }
 }