diff --git a/python/parser.py b/python/parser.py
index fdffa2a..6737d44 100644
--- a/python/parser.py
+++ b/python/parser.py
@@ -1 +1,24 @@
-# placeholder
+import re
+from openpyxl import load_workbook
+
+PLACEHOLDER_RE = re.compile(r"\{\{(.+?)\}\}")
+
+def parse_template(file_path: str) -> dict:
+    wb = load_workbook(file_path, data_only=False)
+    sheets = wb.sheetnames
+    placeholders = []
+
+    for sheet_name in sheets:
+        ws = wb[sheet_name]
+        for row in ws.iter_rows():
+            for cell in row:
+                if cell.value and isinstance(cell.value, str):
+                    m = PLACEHOLDER_RE.search(cell.value)
+                    if m:
+                        placeholders.append({
+                            "name": m.group(1),
+                            "sheet": sheet_name,
+                            "cell": cell.coordinate,
+                        })
+
+    return {"sheets": sheets, "placeholders": placeholders}
diff --git a/tests/create_fixtures.py b/tests/create_fixtures.py
new file mode 100644
index 0000000..671fdc4
--- /dev/null
+++ b/tests/create_fixtures.py
@@ -0,0 +1,10 @@
+from openpyxl import Workbook
+
+wb = Workbook()
+ws = wb.active
+ws.title = "Sheet1"
+ws["B3"] = "{{编号}}"
+ws["C5"] = "{{姓名}}"
+ws["D7"] = "normal_value"  # not a placeholder, should NOT be detected
+wb.save("tests/fixtures/sample_template.xlsx")
+print("fixture created")
diff --git a/tests/fixtures/sample_template.xlsx b/tests/fixtures/sample_template.xlsx
new file mode 100644
index 0000000..c6d220a
Binary files /dev/null and b/tests/fixtures/sample_template.xlsx differ
diff --git a/tests/python/test_parser.py b/tests/python/test_parser.py
index fdffa2a..537fcfb 100644
--- a/tests/python/test_parser.py
+++ b/tests/python/test_parser.py
@@ -1 +1,28 @@
-# placeholder
+import sys, os
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "../../python"))
+
+from parser import parse_template
+
+FIXTURE = os.path.join(os.path.dirname(__file__), "../fixtures/sample_template.xlsx")
+
+def test_returns_sheets():
+    result = parse_template(FIXTURE)
+    assert "sheets" in result
+    assert "Sheet1" in result["sheets"]
+
+def test_detects_placeholders():
+    result = parse_template(FIXTURE)
+    names = [p["name"] for p in result["placeholders"]]
+    assert "编号" in names
+    assert "姓名" in names
+
+def test_ignores_non_placeholders():
+    result = parse_template(FIXTURE)
+    names = [p["name"] for p in result["placeholders"]]
+    assert "normal_value" not in names
+
+def test_placeholder_has_cell_info():
+    result = parse_template(FIXTURE)
+    biaohao = next(p for p in result["placeholders"] if p["name"] == "编号")
+    assert biaohao["sheet"] == "Sheet1"
+    assert biaohao["cell"] == "B3"