diff --git a/src/main/java/pw/yumc/YumCore/config/ConfigNode.java b/src/main/java/pw/yumc/YumCore/config/ConfigNode.java
index d79f685..25a8f87 100644
--- a/src/main/java/pw/yumc/YumCore/config/ConfigNode.java
+++ b/src/main/java/pw/yumc/YumCore/config/ConfigNode.java
@@ -14,6 +14,11 @@ import java.lang.annotation.Target;
 @Retention(RetentionPolicy.RUNTIME)
 public @interface ConfigNode {
 
+    /**
+     * @return 是否允许为空
+     */
+    boolean notNull() default false;
+
     /**
      * Defines the path to the node if it has another as the variable name.
      * Every indention is separated with an dot ('.')
diff --git a/src/main/java/pw/yumc/YumCore/config/InjectConfig.java b/src/main/java/pw/yumc/YumCore/config/InjectConfig.java
index ceed5b7..d88fb2c 100644
--- a/src/main/java/pw/yumc/YumCore/config/InjectConfig.java
+++ b/src/main/java/pw/yumc/YumCore/config/InjectConfig.java
@@ -72,8 +72,8 @@ public abstract class InjectConfig extends AbstractInjectConfig {
             } catch (final IllegalAccessException ex) {
                 Log.log(Level.SEVERE, "自动注入配置错误!", ex);
             }
-        } else {
-            Log.debug("配置节点 {0} 丢失!", realPath);
+        } else if (field.getAnnotation(Nullable.class) == null) {
+            Log.warning(String.format("配置节点 %s 丢失!", realPath));
         }
     }
 }
diff --git a/src/main/java/pw/yumc/YumCore/config/InjectConfigurationSection.java b/src/main/java/pw/yumc/YumCore/config/InjectConfigurationSection.java
index aa2b4db..e09119d 100644
--- a/src/main/java/pw/yumc/YumCore/config/InjectConfigurationSection.java
+++ b/src/main/java/pw/yumc/YumCore/config/InjectConfigurationSection.java
@@ -53,8 +53,8 @@ public class InjectConfigurationSection extends AbstractInjectConfig {
             } catch (final IllegalAccessException ex) {
                 Log.log(Level.SEVERE, "自动注入配置错误!", ex);
             }
-        } else {
-            Log.debug("配置节点 {0} 丢失!", realPath);
+        } else if (field.getAnnotation(Nullable.class) == null) {
+            Log.warning(String.format("配置节点 %s 丢失!", realPath));
         }
     }
 }
diff --git a/src/main/java/pw/yumc/YumCore/config/Nullable.java b/src/main/java/pw/yumc/YumCore/config/Nullable.java
new file mode 100644
index 0000000..42bf36a
--- /dev/null
+++ b/src/main/java/pw/yumc/YumCore/config/Nullable.java
@@ -0,0 +1,19 @@
+package pw.yumc.YumCore.config;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * 允许配置值为空
+ * 
+ * @author 喵♂呜
+ * @since 2016年8月24日 下午10:41:55
+ */
+@Target(ElementType.FIELD)
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Nullable {
+}