diff --git a/stereo/core/st_pipeline.py b/stereo/core/st_pipeline.py
index 58d05012..d68f92bc 100644
--- a/stereo/core/st_pipeline.py
+++ b/stereo/core/st_pipeline.py
@@ -660,7 +660,7 @@ def pca(self,
         from ..algorithm.dim_reduce import pca
         res = pca(data.exp_matrix, n_pcs, svd_solver=svd_solver)
         self.result[res_key] = pd.DataFrame(res['x_pca'])
-        self.result.set_value(f'{res_key}_variance_ratio', res['variance_ratio'])
+        self.result[f'{res_key}_variance_ratio'] = res['variance_ratio']
         key = 'pca'
         self.reset_key_record(key, res_key)