diff --git a/src/DotNetCore.CAP.EntityFrameworkCore/ConsistencyMessageStore.cs b/src/DotNetCore.CAP.EntityFrameworkCore/ConsistencyMessageStore.cs
index a24beb9..641c4c7 100644
--- a/src/DotNetCore.CAP.EntityFrameworkCore/ConsistencyMessageStore.cs
+++ b/src/DotNetCore.CAP.EntityFrameworkCore/ConsistencyMessageStore.cs
@@ -35,7 +35,7 @@ namespace DotNetCore.CAP.EntityFrameworkCore
         public async Task<OperateResult> StoreSentMessageAsync(CapSentMessage message)
         {
             if (message == null) throw new ArgumentNullException(nameof(message));
-           
+
             Context.Add(message);
             await Context.SaveChangesAsync();
             return OperateResult.Success;
diff --git a/src/DotNetCore.CAP.Kafka/CAP.BuilderExtensions.cs b/src/DotNetCore.CAP.Kafka/CAP.BuilderExtensions.cs
index 6ce3418..4c3375e 100644
--- a/src/DotNetCore.CAP.Kafka/CAP.BuilderExtensions.cs
+++ b/src/DotNetCore.CAP.Kafka/CAP.BuilderExtensions.cs
@@ -18,7 +18,6 @@ namespace Microsoft.Extensions.DependencyInjection
         /// <returns>An <see cref="CapBuilder"/> for creating and configuring the CAP system.</returns>
         public static CapBuilder AddKafka(this CapBuilder builder, Action<KafkaOptions> setupAction)
         {
-
             if (setupAction == null) throw new ArgumentNullException(nameof(setupAction));
 
             builder.Services.Configure(setupAction);
diff --git a/src/DotNetCore.CAP.Kafka/CAP.KafkaOptions.cs b/src/DotNetCore.CAP.Kafka/CAP.KafkaOptions.cs
index ad6d83c..30cd208 100644
--- a/src/DotNetCore.CAP.Kafka/CAP.KafkaOptions.cs
+++ b/src/DotNetCore.CAP.Kafka/CAP.KafkaOptions.cs
@@ -1,33 +1,49 @@
 using System;
 using System.Collections.Generic;
-using System.Text;
+using System.Linq;
 
 namespace DotNetCore.CAP.Kafka
 {
+    /// <summary>
+    /// Provides programmatic configuration for the CAP kafka project.
+    /// </summary>
     public class KafkaOptions
     {
-        /// <summary>
-        ///     Gets the Kafka broker id.
-        /// </summary>
-        public int BrokerId { get; }
+        public KafkaOptions()
+        {
+            MainConfig = new Dictionary<string, object>();
+        }
 
         /// <summary>
-        ///     Gets the Kafka broker hostname.
+        /// librdkafka configuration parameters (refer to https://github.com/edenhill/librdkafka/blob/master/CONFIGURATION.md).
+        /// <para>
+        /// Topic configuration parameters are specified via the "default.topic.config" sub-dictionary config parameter.
+        /// </para>
         /// </summary>
-        public string Host { get; }
+        public IDictionary<string, object> MainConfig { get; private set; }
 
         /// <summary>
-        ///     Gets the Kafka broker port.
+        /// The `bootstrap.servers` item config of `MainConfig`.
+        /// <para>
+        /// Initial list of brokers as a CSV list of broker host or host:port.
+        /// </para>
         /// </summary>
-        public int Port { get; }
+        public string Servers { get; set; }
 
-        /// <summary>
-        ///     Returns a JSON representation of the BrokerMetadata object.
-        /// </summary>
-        /// <returns>
-        ///     A JSON representation of the BrokerMetadata object.
-        /// </returns>
-        public override string ToString()
-            => $"{{ \"BrokerId\": {BrokerId}, \"Host\": \"{Host}\", \"Port\": {Port} }}";
+        internal IEnumerable<KeyValuePair<string, object>> AsRdkafkaConfig()
+        {
+            if (!MainConfig.ContainsKey("bootstrap.servers"))
+            {
+                if (string.IsNullOrEmpty(Servers))
+                {
+                    throw new ArgumentNullException(nameof(Servers));
+                }
+                else
+                {
+                    MainConfig.Add("bootstrap.servers", Servers);
+                }
+            }
+            return MainConfig.AsEnumerable();
+        }
     }
-}
+}
\ No newline at end of file
diff --git a/src/DotNetCore.CAP.Kafka/IProcessor.KafkaJobProcessor.cs b/src/DotNetCore.CAP.Kafka/IProcessor.KafkaJobProcessor.cs
index c0538dd..8a9e039 100644
--- a/src/DotNetCore.CAP.Kafka/IProcessor.KafkaJobProcessor.cs
+++ b/src/DotNetCore.CAP.Kafka/IProcessor.KafkaJobProcessor.cs
@@ -123,7 +123,7 @@ namespace DotNetCore.CAP.Kafka
         {
             try
             {
-                var config = new Dictionary<string, object> { { "bootstrap.servers", _kafkaOptions.Host } };
+                var config = _kafkaOptions.AsRdkafkaConfig();
                 using (var producer = new Producer<Null, string>(config, null, new StringSerializer(Encoding.UTF8)))
                 {
                     var message = producer.ProduceAsync(topic, null, content).Result;
diff --git a/src/DotNetCore.CAP.Kafka/KafkaConsumerClient.cs b/src/DotNetCore.CAP.Kafka/KafkaConsumerClient.cs
index ce9f383..ae574a4 100644
--- a/src/DotNetCore.CAP.Kafka/KafkaConsumerClient.cs
+++ b/src/DotNetCore.CAP.Kafka/KafkaConsumerClient.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Text;
 using Confluent.Kafka;
 using Confluent.Kafka.Serialization;
@@ -56,12 +55,11 @@ namespace DotNetCore.CAP.Kafka
 
         private void InitKafkaClient()
         {
-            var config = new Dictionary<string, object>{
-                { "group.id", _groupId },
-                { "bootstrap.servers", _kafkaOptions.Host }
-            };
+            _kafkaOptions.MainConfig.Add("group.id", _groupId);
 
+            var config = _kafkaOptions.AsRdkafkaConfig();
             _consumerClient = new Consumer<Null, string>(config, null, StringDeserializer);
+
             _consumerClient.OnMessage += ConsumerClient_OnMessage;
         }
 
diff --git a/src/DotNetCore.CAP.RabbitMQ/CAP.RabbiMQOptions.cs b/src/DotNetCore.CAP.RabbitMQ/CAP.RabbiMQOptions.cs
index 6d2a2d4..6163ae9 100644
--- a/src/DotNetCore.CAP.RabbitMQ/CAP.RabbiMQOptions.cs
+++ b/src/DotNetCore.CAP.RabbitMQ/CAP.RabbiMQOptions.cs
@@ -1,8 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-
-namespace DotNetCore.CAP.RabbitMQ
+namespace DotNetCore.CAP.RabbitMQ
 {
     public class RabbitMQOptions
     {
@@ -68,4 +64,4 @@ namespace DotNetCore.CAP.RabbitMQ
         /// </summary>
         public int Port { get; set; } = -1;
     }
-}
+}
\ No newline at end of file
diff --git a/src/DotNetCore.CAP.RabbitMQ/RabbitMQConsumerClientFactory.cs b/src/DotNetCore.CAP.RabbitMQ/RabbitMQConsumerClientFactory.cs
index 48a75e6..2d64f0c 100644
--- a/src/DotNetCore.CAP.RabbitMQ/RabbitMQConsumerClientFactory.cs
+++ b/src/DotNetCore.CAP.RabbitMQ/RabbitMQConsumerClientFactory.cs
@@ -1,5 +1,4 @@
-using DotNetCore.CAP.Infrastructure;
-using Microsoft.Extensions.Options;
+using Microsoft.Extensions.Options;
 
 namespace DotNetCore.CAP.RabbitMQ
 {
diff --git a/src/DotNetCore.CAP/CAP.Options.cs b/src/DotNetCore.CAP/CAP.Options.cs
index 51d293f..2ca40b0 100644
--- a/src/DotNetCore.CAP/CAP.Options.cs
+++ b/src/DotNetCore.CAP/CAP.Options.cs
@@ -7,7 +7,7 @@ namespace DotNetCore.CAP.Infrastructure
     /// </summary>
     public class CapOptions
     {
-         /// <summary>
+        /// <summary>
         /// Corn expression for configuring retry cron job. Default is 1 min.
         /// </summary>
         public string CronExp { get; set; } = Cron.Minutely();