diff --git a/pom.xml b/pom.xml
index 682c3bc..44efdcd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>cloud.tianai.captcha</groupId>
     <artifactId>tianai-captcha</artifactId>
-    <version>1.4.1</version>
+    <version>1.4.2</version>
 
     <name>tianai-captcha</name>
     <description>行为验证码</description>
diff --git a/src/main/java/cloud/tianai/captcha/generator/AbstractImageCaptchaGenerator.java b/src/main/java/cloud/tianai/captcha/generator/AbstractImageCaptchaGenerator.java
index 5092920..6c37b2e 100644
--- a/src/main/java/cloud/tianai/captcha/generator/AbstractImageCaptchaGenerator.java
+++ b/src/main/java/cloud/tianai/captcha/generator/AbstractImageCaptchaGenerator.java
@@ -122,7 +122,7 @@ public abstract class AbstractImageCaptchaGenerator implements ImageCaptchaGener
 
     protected ResourceMap requiredRandomGetTemplate(String type, String tag) {
         ResourceMap templateMap = imageCaptchaResourceManager.randomGetTemplate(type, tag);
-        if (CollectionUtils.isEmpty(templateMap)) {
+        if (templateMap == null || CollectionUtils.isEmpty(templateMap.getResourceMap())) {
             throw new ImageCaptchaException("随机获取模板资源失败， 获取到的资源为空, type=" + type + ",tag=" + tag);
         }
         return templateMap;
@@ -137,7 +137,7 @@ public abstract class AbstractImageCaptchaGenerator implements ImageCaptchaGener
     }
 
 
-    protected InputStream getTemplateFile(Map<String, Resource> templateImages, String imageName) {
+    protected InputStream getTemplateFile(ResourceMap templateImages, String imageName) {
         Resource resource = templateImages.get(imageName);
         if (resource == null) {
             throw new IllegalArgumentException("查找模板异常， 该模板下未找到 ".concat(imageName));
@@ -145,7 +145,7 @@ public abstract class AbstractImageCaptchaGenerator implements ImageCaptchaGener
         return getResourceInputStream(resource, null);
     }
 
-    protected BufferedImage getTemplateImage(Map<String, Resource> templateImages, String imageName) {
+    protected BufferedImage getTemplateImage(ResourceMap templateImages, String imageName) {
         InputStream stream = getTemplateFile(templateImages, imageName);
         BufferedImage bufferedImage = CaptchaImageUtils.wrapFile2BufferedImage(stream);
         closeStream(stream);
@@ -190,7 +190,7 @@ public abstract class AbstractImageCaptchaGenerator implements ImageCaptchaGener
         return stream;
     }
 
-    protected Optional<BufferedImage> getTemplateImageOfOptional(Map<String, Resource> templateImages, String imageName) {
+    protected Optional<BufferedImage> getTemplateImageOfOptional(ResourceMap templateImages, String imageName) {
         Optional<InputStream> optional = getTemplateFileOfOptional(templateImages, imageName);
         if (optional.isPresent()) {
             InputStream inputStream = optional.get();
@@ -201,7 +201,7 @@ public abstract class AbstractImageCaptchaGenerator implements ImageCaptchaGener
         return Optional.empty();
     }
 
-    protected Optional<InputStream> getTemplateFileOfOptional(Map<String, Resource> templateImages, String imageName) {
+    protected Optional<InputStream> getTemplateFileOfOptional(ResourceMap templateImages, String imageName) {
         Resource resource = templateImages.get(imageName);
         if (resource == null) {
             return Optional.empty();
diff --git a/src/main/java/cloud/tianai/captcha/resource/common/model/dto/ResourceMap.java b/src/main/java/cloud/tianai/captcha/resource/common/model/dto/ResourceMap.java
index cb03db4..31a74ff 100644
--- a/src/main/java/cloud/tianai/captcha/resource/common/model/dto/ResourceMap.java
+++ b/src/main/java/cloud/tianai/captcha/resource/common/model/dto/ResourceMap.java
@@ -1,10 +1,10 @@
 package cloud.tianai.captcha.resource.common.model.dto;
 
-import cloud.tianai.captcha.resource.common.model.dto.Resource;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
 
 import java.util.HashMap;
+import java.util.Map;
 
 /**
  * @Author: 天爱有情
@@ -12,24 +12,47 @@ import java.util.HashMap;
  * @Description 存储一组Resource的Map, 增加tag标记
  */
 @Data
-@EqualsAndHashCode(callSuper = true)
-public class ResourceMap extends HashMap<String, Resource> {
+@EqualsAndHashCode
+public class ResourceMap {
 
+    private Map<String, Resource> resourceMap;
     private String tag;
 
     public ResourceMap(String tag) {
         this.tag = tag;
+        this.resourceMap = new HashMap<>();
     }
 
     public ResourceMap(String tag, int initialCapacity) {
-        super(initialCapacity);
         this.tag = tag;
+        this.resourceMap = new HashMap<>(initialCapacity);
     }
 
     public ResourceMap(int initialCapacity) {
-        super(initialCapacity);
+        this.resourceMap = new HashMap<>(initialCapacity);
     }
 
     public ResourceMap() {
     }
+
+    private Map<String, Resource> getResourceMapOfCreate() {
+        if (resourceMap == null) {
+            resourceMap = new HashMap<>(2);
+        }
+        return resourceMap;
+    }
+
+    // ================== Map ==================
+
+    public Resource put(String key, Resource value) {
+        return getResourceMapOfCreate().put(key, value);
+    }
+
+    public Resource get(Object key) {
+        return getResourceMapOfCreate().get(key);
+    }
+    public Resource remove(Object key) {
+        return getResourceMapOfCreate().remove(key);
+    }
+
 }