diff --git a/xinference/model/llm/llm_family.json b/xinference/model/llm/llm_family.json
index 5b8a9003dd..0b4621bd45 100644
--- a/xinference/model/llm/llm_family.json
+++ b/xinference/model/llm/llm_family.json
@@ -1116,6 +1116,17 @@
         "model_file_name_template": "qwen14b-ggml-{quantization}.bin",
         "model_revision": "11efca556af372b6f3c730322a4962e9900a2990"
       },
+      {
+        "model_format": "pytorch",
+        "model_size_in_billions": "1_8",
+        "quantizations": [
+          "4-bit",
+          "8-bit",
+          "none"
+        ],
+        "model_id": "Qwen/Qwen-1_8B-Chat",
+        "model_revision": "c3db8007171847931da7efa4b2ed4309afcce021"
+      },
       {
         "model_format": "pytorch",
         "model_size_in_billions": 7,
diff --git a/xinference/model/llm/llm_family.py b/xinference/model/llm/llm_family.py
index 4ec72f4a74..9fcff01180 100644
--- a/xinference/model/llm/llm_family.py
+++ b/xinference/model/llm/llm_family.py
@@ -19,7 +19,7 @@
 from threading import Lock
 from typing import Any, Dict, List, Optional, Tuple, Type, Union
 
-from pydantic import BaseModel, Field, Protocol, ValidationError
+from pydantic import BaseModel, Field, Protocol, ValidationError, validator
 from pydantic.error_wrappers import ErrorWrapper
 from pydantic.parse import load_str_bytes
 from pydantic.types import StrBytes
@@ -45,7 +45,8 @@
 
 class GgmlLLMSpecV1(BaseModel):
     model_format: Literal["ggmlv3", "ggufv2"]
-    model_size_in_billions: int
+    # Must in order that `str` first, then `int`
+    model_size_in_billions: Union[str, int]
     quantizations: List[str]
     model_id: str
     model_file_name_template: str
@@ -53,16 +54,39 @@ class GgmlLLMSpecV1(BaseModel):
     model_uri: Optional[str]
     model_revision: Optional[str]
 
+    @validator("model_size_in_billions", pre=False)
+    def validate_model_size_with_radix(cls, v: object) -> object:
+        if isinstance(v, str):
+            if (
+                "_" in v
+            ):  # for example, "1_8" just returns "1_8", otherwise int("1_8") returns 18
+                return v
+            else:
+                return int(v)
+        return v
+
 
 class PytorchLLMSpecV1(BaseModel):
     model_format: Literal["pytorch", "gptq"]
-    model_size_in_billions: int
+    # Must in order that `str` first, then `int`
+    model_size_in_billions: Union[str, int]
     quantizations: List[str]
     model_id: str
     model_hub: str = "huggingface"
     model_uri: Optional[str]
     model_revision: Optional[str]
 
+    @validator("model_size_in_billions", pre=False)
+    def validate_model_size_with_radix(cls, v: object) -> object:
+        if isinstance(v, str):
+            if (
+                "_" in v
+            ):  # for example, "1_8" just returns "1_8", otherwise int("1_8") returns 18
+                return v
+            else:
+                return int(v)
+        return v
+
 
 class PromptStyleV1(BaseModel):
     style_name: str
@@ -152,7 +176,7 @@ def download_from_self_hosted_storage() -> bool:
 def get_legacy_cache_path(
     model_name: str,
     model_format: str,
-    model_size_in_billions: Optional[int] = None,
+    model_size_in_billions: Optional[Union[str, int]] = None,
     quantization: Optional[str] = None,
 ) -> str:
     full_name = f"{model_name}-{model_format}-{model_size_in_billions}b-{quantization}"
diff --git a/xinference/model/llm/llm_family_modelscope.json b/xinference/model/llm/llm_family_modelscope.json
index fd0d3f59ac..9aaab67039 100644
--- a/xinference/model/llm/llm_family_modelscope.json
+++ b/xinference/model/llm/llm_family_modelscope.json
@@ -1366,6 +1366,18 @@
         "model_file_name_template": "qwen14b-ggml-{quantization}.bin",
         "model_revision": "v0.0.2"
       },
+      {
+        "model_format": "pytorch",
+        "model_size_in_billions": "1_8",
+        "quantizations": [
+          "4-bit",
+          "8-bit",
+          "none"
+        ],
+        "model_hub": "modelscope",
+        "model_id": "qwen/Qwen-1_8B-Chat",
+        "model_revision": "v1.0.0"
+      },
       {
         "model_format": "pytorch",
         "model_size_in_billions": 7,
diff --git a/xinference/web/ui/src/scenes/launch_model/modelCard.js b/xinference/web/ui/src/scenes/launch_model/modelCard.js
index bd2bfe7d4a..7a86277635 100644
--- a/xinference/web/ui/src/scenes/launch_model/modelCard.js
+++ b/xinference/web/ui/src/scenes/launch_model/modelCard.js
@@ -91,7 +91,8 @@ const ModelCard = ({ url, modelData, gpuAvailable, is_custom = false }) => {
             .filter(
               (spec) =>
                 spec.model_format === modelFormat &&
-                spec.model_size_in_billions === parseFloat(modelSize)
+                spec.model_size_in_billions ===
+                  (modelSize.includes('_') ? modelSize : parseFloat(modelSize))
             )
             .flatMap((spec) => spec.quantizations)
         ),