diff --git a/api/configs/middleware/vdb/oceanbase_config.py b/api/configs/middleware/vdb/oceanbase_config.py
index 99f4c49407..7c9376f86b 100644
--- a/api/configs/middleware/vdb/oceanbase_config.py
+++ b/api/configs/middleware/vdb/oceanbase_config.py
@@ -40,8 +40,12 @@ class OceanBaseVectorConfig(BaseSettings):
 
     OCEANBASE_FULLTEXT_PARSER: str | None = Field(
         description=(
-            "Fulltext parser to use for text indexing. Options: 'japanese_ftparser' (Japanese), "
-            "'thai_ftparser' (Thai), 'ik' (Chinese). Default is 'ik'"
+            "Fulltext parser to use for text indexing. "
+            "Built-in options: 'ngram' (N-gram tokenizer for English/numbers), "
+            "'beng' (Basic English tokenizer), 'space' (Space-based tokenizer), "
+            "'ngram2' (Improved N-gram tokenizer), 'ik' (Chinese tokenizer). "
+            "External plugins (require installation): 'japanese_ftparser' (Japanese tokenizer), "
+            "'thai_ftparser' (Thai tokenizer). Default is 'ik'"
         ),
         default="ik",
     )
diff --git a/api/core/rag/datasource/vdb/oceanbase/oceanbase_vector.py b/api/core/rag/datasource/vdb/oceanbase/oceanbase_vector.py
index 49cf900126..b3db7332e8 100644
--- a/api/core/rag/datasource/vdb/oceanbase/oceanbase_vector.py
+++ b/api/core/rag/datasource/vdb/oceanbase/oceanbase_vector.py
@@ -123,7 +123,7 @@ class OceanBaseVector(BaseVector):
                 # Get parser from config or use default ik parser
                 parser_name = dify_config.OCEANBASE_FULLTEXT_PARSER or "ik"
 
-                allowed_parsers = ["ik", "japanese_ftparser", "thai_ftparser"]
+                allowed_parsers = ["ngram", "beng", "space", "ngram2", "ik", "japanese_ftparser", "thai_ftparser"]
                 if parser_name not in allowed_parsers:
                     raise ValueError(
                         f"Invalid OceanBase full-text parser: {parser_name}. "
diff --git a/docker/.env.example b/docker/.env.example
index d4e8ab3beb..07b4088470 100644
--- a/docker/.env.example
+++ b/docker/.env.example
@@ -655,6 +655,8 @@ LINDORM_USING_UGC=True
 LINDORM_QUERY_TIMEOUT=1
 
 # OceanBase Vector configuration, only available when VECTOR_STORE is `oceanbase`
+# Built-in fulltext parsers are `ngram`, `beng`, `space`, `ngram2`, `ik`
+# External fulltext parsers (require plugin installation) are `japanese_ftparser`, `thai_ftparser`
 OCEANBASE_VECTOR_HOST=oceanbase
 OCEANBASE_VECTOR_PORT=2881
 OCEANBASE_VECTOR_USER=root@test