diff --git a/deepdoc/parser/pdf_parser.py b/deepdoc/parser/pdf_parser.py
index 9f22cc18c..95ab40f97 100644
--- a/deepdoc/parser/pdf_parser.py
+++ b/deepdoc/parser/pdf_parser.py
@@ -353,74 +353,6 @@ class RAGFlowPdfParser:
             self.boxes[i]["bottom"] += self.page_cum_height[self.boxes[i]["page_number"] - 1]
 
     def _assign_column(self, boxes, zoomin=3):
-        # if not boxes:
-        #     return boxes
-
-        # if all("col_id" in b for b in boxes):
-        #     return boxes
-
-        # by_page = defaultdict(list)
-        # for b in boxes:
-        #     by_page[b["page_number"]].append(b)
-
-        # page_info = {}  # pg -> dict(page_w, left_edge, cand_cols)
-        # counter = Counter()
-
-        # for pg, bxs in by_page.items():
-        #     if not bxs:
-        #         page_info[pg] = {"page_w": 1.0, "left_edge": 0.0, "cand": 1}
-        #         counter[1] += 1
-        #         continue
-
-        #     if hasattr(self, "page_images") and self.page_images and len(self.page_images) >= pg:
-        #         page_w = self.page_images[pg - 1].size[0] / max(1, zoomin)
-        #         left_edge = 0.0
-        #     else:
-        #         xs0 = [box["x0"] for box in bxs]
-        #         xs1 = [box["x1"] for box in bxs]
-        #         left_edge = float(min(xs0))
-        #         page_w = max(1.0, float(max(xs1) - left_edge))
-
-        #     widths = [max(1.0, (box["x1"] - box["x0"])) for box in bxs]
-        #     median_w = float(np.median(widths)) if widths else 1.0
-
-        #     raw_cols = int(page_w / max(1.0, median_w))
-
-        #     # cand = raw_cols if (raw_cols >= 2 and median_w < page_w / raw_cols * 0.8) else 1
-        #     cand = raw_cols
-
-        #     page_info[pg] = {"page_w": page_w, "left_edge": left_edge, "cand": cand}
-        #     counter[cand] += 1
-
-        #     logging.info(f"[Page {pg}] median_w={median_w:.2f}, page_w={page_w:.2f}, raw_cols={raw_cols}, cand={cand}")
-
-        # global_cols = counter.most_common(1)[0][0]
-        # logging.info(f"Global column_num decided by majority: {global_cols}")
-
-        # for pg, bxs in by_page.items():
-        #     if not bxs:
-        #         continue
-
-        #     page_w = page_info[pg]["page_w"]
-        #     left_edge = page_info[pg]["left_edge"]
-
-        #     if global_cols == 1:
-        #         for box in bxs:
-        #             box["col_id"] = 0
-        #         continue
-
-        #     for box in bxs:
-        #         w = box["x1"] - box["x0"]
-        #         if w >= 0.8 * page_w:
-        #             box["col_id"] = 0
-        #             continue
-        #         cx = 0.5 * (box["x0"] + box["x1"])
-        #         norm_cx = (cx - left_edge) / page_w
-        #         norm_cx = max(0.0, min(norm_cx, 0.999999))
-        #         box["col_id"] = int(min(global_cols - 1, norm_cx * global_cols))
-
-        # return boxes
-
         if not boxes:
             return boxes
         if all("col_id" in b for b in boxes):