diff --git a/Utils/rule.py b/Utils/rule.py
index 9abe40b..ea38542 100644
--- a/Utils/rule.py
+++ b/Utils/rule.py
@@ -25,6 +25,10 @@ def __hash__(self):
     def __eq__(self, other):
         return self.Type == other.Type and self.Payload == other.Payload
 
+    def includes(self, other):
+        return ("." + other.Payload if other.Type == "DomainSuffix" else other.Payload).endswith(
+            "." + self.Payload if self.Type == "DomainSuffix" else self.Payload)
+
 
 def custom_convert(src: Path) -> set:
     src_custom = open(src, mode="r", encoding="utf-8").read().splitlines()
@@ -204,3 +208,18 @@ def apply_patch(src: set, name: str) -> set:
                 logging.warning(f"Not found: {rule}")
     logging.info(f'Patch "{name + ".txt"}" applied.')
     return src
+
+
+def dedup(src: set):
+    list_length_sorted = [item for item in src]
+    list_length_sorted.sort(key=lambda item: len(str(item)))
+    set_unique = set()
+    for item in list_length_sorted:
+        flag_unique = True
+        for added in set_unique:
+            if added.includes(item):
+                flag_unique = False
+                logging.debug(f"{item} is removed as duplicated with {added}.")
+        if flag_unique:
+            set_unique.add(item)
+    return set_unique
diff --git a/generate.py b/generate.py
index 85e2900..60dbddb 100644
--- a/generate.py
+++ b/generate.py
@@ -62,6 +62,7 @@
 
 set_exclusions = set()
 logger.debug("Start deduplicating reject and exclude set.")
+set_rejections = rule.dedup(set_rejections)
 for domain_exclude in set_exclusions_raw.copy():
     for domain_reject in set_rejections.copy():
         if (domain_reject.Payload == domain_exclude.Payload and domain_reject.Type == domain_exclude.Type) \
@@ -69,7 +70,7 @@
                     domain_reject.Type == "DomainFull" and domain_exclude.Type == "DomainSuffix"):
             set_rejections.remove(domain_reject)
             set_exclusions_raw.remove(domain_exclude)
-            logger.debug(f"{domain_reject} is removed as duplicated with {domain_exclude}.")
+            logger.debug(f"{domain_reject} is removed as excluded by {domain_exclude}.")
 
 for domain_exclude in set_exclusions_raw:
     for domain_reject in set_rejections:
@@ -96,27 +97,17 @@
 logger.info("Start generating domestic rules.")
 START_TIME = time_ns()
 
-src_domestic_raw = set(open(const.PATH_SOURCE_V2FLY/"geolocation-cn", mode="r", encoding="utf-8").read().splitlines())
-set_domestic_raw = geosite.parse(src_domestic_raw, None, ["!cn"])
-logger.info(f"Imported {len(set_domestic_raw)} domestic rules from v2fly geolocation-cn list.")
+src_domestic = set(open(const.PATH_SOURCE_V2FLY/"geolocation-cn", mode="r", encoding="utf-8").read().splitlines())
+set_domestic = geosite.parse(src_domestic, None, ["!cn"])
+logger.info(f"Imported {len(set_domestic)} domestic rules from v2fly geolocation-cn list.")
 
-# Add all domestic TLDs to domestic rules, then remove domestic domains with domestic TLDs.
+# Add all domestic TLDs to domestic rules, then perform deduplication.
 src_domestic_tlds = set(open(const.PATH_SOURCE_V2FLY/"tld-cn", mode="r", encoding="utf-8").read().splitlines())
 set_domestic_tlds = geosite.parse(src_domestic_tlds)
 logger.info(f"Imported {len(set_domestic_tlds)} domestic TLDs.")
-set_domestic = set()
-for domain in set_domestic_raw:
-    is_domestic = False
-    for tld in set_domestic_tlds:
-        if domain.Payload.endswith(tld.Payload):
-            logger.debug(f'"{domain.Payload}"" is removed for having a domestic TLD "{tld.Payload}"".')
-            is_domestic = True
-            break
-    if not is_domestic:
-        set_domestic.add(domain)
-logger.info(f"Removed {len(set_domestic_raw) - len(set_domestic)} domestic domains having domestic TLD.")
 set_domestic |= set_domestic_tlds
 set_domestic = rule.apply_patch(set_domestic, "domestic")
+set_domestic = rule.dedup(set_domestic)
 logger.info(f"Generated {len(set_domestic)} domestic rules.")
 
 list_domestic_sorted = rule.set_to_sorted_list(set_domestic)