diff --git a/CHANGES.md b/CHANGES.md
index 79fd9c08bb..0cb2475b36 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -80,6 +80,7 @@ Release Notes.
 * Unify module name `receiver_zipkin` to `receiver-zipkin`, remove `receiver_jaeger` from `application.yaml`. 
 * Introduce the entity of Process type.
 * Set the length of event#parameters to 2000.
+* Limit the length of Event#parameters.
 
 #### UI
 
diff --git a/oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/source/Event.java b/oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/source/Event.java
index 75b0cb572d..beabd17bb3 100644
--- a/oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/source/Event.java
+++ b/oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/source/Event.java
@@ -19,8 +19,10 @@
 package org.apache.skywalking.oap.server.core.source;
 
 import com.google.common.base.Strings;
+
 import java.util.HashMap;
 import java.util.Map;
+
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.Setter;
@@ -37,8 +39,8 @@ import org.apache.skywalking.oap.server.core.remote.grpc.proto.RemoteData;
 import org.apache.skywalking.oap.server.core.storage.StorageHashMapBuilder;
 import org.apache.skywalking.oap.server.core.storage.annotation.Column;
 
-import static org.apache.skywalking.oap.server.library.util.StringUtil.isNotBlank;
 import static org.apache.skywalking.oap.server.core.source.DefaultScopeDefine.EVENT;
+import static org.apache.skywalking.oap.server.library.util.StringUtil.isNotBlank;
 
 @Getter
 @Setter
@@ -73,6 +75,8 @@ public class Event extends Metrics implements ISource, WithMetadata, LongValueHo
 
     public static final String END_TIME = "end_time";
 
+    private static final int PARAMETER_MAX_LENGTH = 2000;
+
     @Override
     protected String id0() {
         return getUuid();
@@ -99,7 +103,7 @@ public class Event extends Metrics implements ISource, WithMetadata, LongValueHo
     @Column(columnName = MESSAGE)
     private String message;
 
-    @Column(columnName = PARAMETERS, storageOnly = true, length = 20000)
+    @Column(columnName = PARAMETERS, storageOnly = true, length = PARAMETER_MAX_LENGTH)
     private String parameters;
 
     @Column(columnName = START_TIME)
@@ -146,6 +150,14 @@ public class Event extends Metrics implements ISource, WithMetadata, LongValueHo
         return true;
     }
 
+    /**
+     * @since 9.0.0 Limit the length of {@link #parameters}
+     */
+    public void setParameters(String parameters) {
+        this.parameters = parameters == null || parameters.length() <= PARAMETER_MAX_LENGTH ?
+                parameters : parameters.substring(0, PARAMETER_MAX_LENGTH);
+    }
+
     @Override
     public void calculate() {
     }