diff --git a/hydromodel/trainers/evaluate.py b/hydromodel/trainers/evaluate.py
index 9ec0f7e..70421f0 100644
--- a/hydromodel/trainers/evaluate.py
+++ b/hydromodel/trainers/evaluate.py
@@ -1,22 +1,20 @@
 """
 Author: Wenyu Ouyang
 Date: 2022-10-25 21:16:22
-LastEditTime: 2024-09-14 20:31:58
+LastEditTime: 2024-09-17 14:23:29
 LastEditors: Wenyu Ouyang
 Description: Plots for calibration and testing results
 FilePath: \hydromodel\hydromodel\trainers\evaluate.py
 Copyright (c) 2023-2024 Wenyu Ouyang. All rights reserved.
 """
 
-import pathlib
-import pandas as pd
 import os
+import yaml
 import numpy as np
+import pandas as pd
 import xarray as xr
-import spotpy
-import yaml
 
-from hydroutils import hydro_file, hydro_stat
+from hydroutils import hydro_stat
 from hydrodatasource.utils.utils import streamflow_unit_conv
 
 from hydromodel.datasets import *
@@ -270,6 +268,38 @@ def load_results(self):
         return xr.open_dataset(file_path)
 
 
+def _load_csv_results_pandas(sceua_calibrated_file_name):
+    return pd.read_csv(sceua_calibrated_file_name + ".csv")
+
+
+def _get_minlikeindex_pandas(results_df, like_index=1, verbose=True):
+    """
+    Get the minimum objectivefunction of your result DataFrame
+
+    :results_df: Expects a pandas DataFrame with a "like" column for objective functions
+    :type: DataFrame
+
+    :return: Index of the position in the DataFrame with the minimum objective function
+        value and the value of the minimum objective function
+    :rtype: int and float
+    """
+    # Extract the 'like' column based on the like_index
+    like_column = f"like{str(like_index)}"
+    likes = results_df[like_column].values
+
+    # Find the minimum value in the 'like' column
+    minimum = np.nanmin(likes)
+    value = str(round(minimum, 4))
+    index = np.where(likes == minimum)
+    text2 = " has the lowest objective function with: "
+    textv = f"Run number {str(index[0][0])}{text2}{value}"
+
+    if verbose:
+        print(textv)
+
+    return index[0][0], minimum
+
+
 def _read_save_sceua_calibrated_params(basin_id, save_dir, sceua_calibrated_file_name):
     """
     read the parameters' file generated by spotpy SCE-UA when finishing calibration
@@ -289,16 +319,19 @@ def _read_save_sceua_calibrated_params(basin_id, save_dir, sceua_calibrated_file
     -------
 
     """
-    results = spotpy.analyser.load_csv_results(sceua_calibrated_file_name)
-    bestindex, bestobjf = spotpy.analyser.get_minlikeindex(
-        results
-    )  # 结果数组中具有最小目标函数的位置的索引
+    results = _load_csv_results_pandas(sceua_calibrated_file_name)
+    # Index of the position in the results array with the minimum objective function
+    bestindex, bestobjf = _get_minlikeindex_pandas(results)
+    # the following code is from spotpy but its performance is not good so we use pandas to replace it
+    # results = spotpy.analyser.load_csv_results(sceua_calibrated_file_name)
+    # bestindex, bestobjf = spotpy.analyser.get_minlikeindex(results)
     best_model_run = results[bestindex]
     fields = [word for word in best_model_run.dtype.names if word.startswith("par")]
     best_calibrate_params = pd.DataFrame(list(best_model_run[fields]))
     save_file = os.path.join(save_dir, basin_id + "_calibrate_params.txt")
     best_calibrate_params.to_csv(save_file, sep=",", index=False, header=True)
-    return np.array(best_calibrate_params).reshape(1, -1)  # 返回一列最佳的结果
+    # Return the best result as a single row
+    return np.array(best_calibrate_params).reshape(1, -1)
 
 
 def _read_all_basin_params(basins, param_dir):
diff --git a/test/conftest.py b/test/conftest.py
index 297a580..0178b47 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -1,6 +1,18 @@
+"""
+Author: Wenyu Ouyang
+Date: 2024-08-14 16:34:32
+LastEditTime: 2024-09-17 14:32:47
+LastEditors: Wenyu Ouyang
+Description: Some common fixtures for testing
+FilePath: \hydromodel\test\conftest.py
+Copyright (c) 2023-2024 Wenyu Ouyang. All rights reserved.
+"""
+
 import os
 import numpy as np
 import pytest
+import spotpy
+from spotpy.examples.spot_setup_hymod_python import spot_setup
 
 from hydrodataset import Camels
 from hydromodel import SETTING
@@ -52,3 +64,28 @@ def qobs(basin_area, camels, basins):
     r = qobs["streamflow"] / basin_area["area_gages2"]
     r_mmd = r.pint.to(target_unit)
     return np.expand_dims(r_mmd.to_numpy().transpose(1, 0), axis=2)
+
+
+@pytest.fixture(scope="session")
+def hymod_setup():
+    """
+    A pytest fixture that runs the hymod calibration and returns the results.
+    This will run before any test that requires it.
+    """
+    setup = spot_setup(spotpy.objectivefunctions.rmse)
+    if not os.path.exists("test/SCEUA_hymod.csv"):
+        # Set up the hymod model and sampler
+
+        # Create SCE-UA sampler
+        sampler = spotpy.algorithms.sceua(
+            setup, dbname="test/SCEUA_hymod", dbformat="csv"
+        )
+
+        # Calibration parameters
+        repetitions = 5000  # Maximum iterations
+
+        # Run the sampler
+        sampler.sample(repetitions, ngs=7, kstop=3, peps=0.1, pcento=0.1)
+
+    # Return the results for further use
+    return setup
diff --git a/test/test_data_visualize.py b/test/test_data_visualize.py
index ace135e..614da7f 100644
--- a/test/test_data_visualize.py
+++ b/test/test_data_visualize.py
@@ -1,16 +1,16 @@
 """
 Author: Wenyu Ouyang
 Date: 2022-10-25 21:16:22
-LastEditTime: 2024-09-11 21:25:42
+LastEditTime: 2024-09-17 14:30:58
 LastEditors: Wenyu Ouyang
 Description: Test for results visualization
 FilePath: \hydromodel\test\test_data_visualize.py
 Copyright (c) 2021-2022 Wenyu Ouyang. All rights reserved.
 """
 
+import spotpy
 import matplotlib.pyplot as plt
 import spotpy
-from spotpy.examples.spot_setup_hymod_python import spot_setup as hymod_setup
 
 from hydroutils import hydro_time
 
@@ -20,19 +20,7 @@
 from hydromodel.trainers.evaluate import _read_save_sceua_calibrated_params
 
 
-def test_run_hymod_calibration():
-    # a case from spotpy example
-    setup = hymod_setup(spotpy.objectivefunctions.rmse)
-
-    # 创建SCE-UA算法的sampler
-    sampler = spotpy.algorithms.sceua(setup, dbname="test/SCEUA_hymod", dbformat="csv")
-
-    # 设置校准参数
-    repetitions = 5000  # 最大迭代次数
-
-    # 运行sampler
-    sampler.sample(repetitions, ngs=7, kstop=3, peps=0.1, pcento=0.1)
-
+def test_run_hymod_calibration(hymod_setup):
     # 从CSV文件加载结果
     results = spotpy.analyser.load_csv_results("test/SCEUA_hymod")
 
@@ -58,7 +46,7 @@ def test_run_hymod_calibration():
         linestyle="solid",
         label=f"Best objf.={str(bestobjf)}",
     )
-    plt.plot(setup.evaluation(), "r.", markersize=3, label="Observation data")
+    plt.plot(hymod_setup.evaluation(), "r.", markersize=3, label="Observation data")
     plt.xlabel("Number of Observation Points")
     plt.ylabel("Discharge [l s-1]")
     plt.legend(loc="upper right")
diff --git a/test/test_evaluate.py b/test/test_evaluate.py
index 1a1ea30..80be201 100644
--- a/test/test_evaluate.py
+++ b/test/test_evaluate.py
@@ -1,7 +1,7 @@
 """
 Author: Wenyu Ouyang
 Date: 2024-09-14 17:00:29
-LastEditTime: 2024-09-14 17:25:16
+LastEditTime: 2024-09-17 14:32:30
 LastEditors: Wenyu Ouyang
 Description: Test the evaluate module
 FilePath: \hydromodel\test\test_evaluate.py
@@ -12,7 +12,10 @@
 import pytest
 import xarray as xr
 import numpy as np
-from hydromodel.trainers.evaluate import Evaluator
+
+from spotpy.analyser import get_minlikeindex
+
+from hydromodel.trainers.evaluate import Evaluator, _get_minlikeindex_pandas
 
 
 @pytest.fixture
@@ -95,3 +98,34 @@ def test_predict(sample_dataset, evaluator, mocker):
     assert "prcp" in qsim
     assert "prcp" in qobs
     assert "prcp" in etsim
+
+
+def test_get_minlikeindex(hymod_setup):
+    filename = "test/SCEUA_hymod"
+    # Read data using np.genfromtxt (original)
+    results_np = np.genfromtxt(
+        f"{filename}.csv", delimiter=",", names=True, invalid_raise=False
+    )
+
+    # Read data using pandas (new method)
+    results_pd = pd.read_csv(f"{filename}.csv")
+
+    # Run the original get_minlikeindex function
+    original_index, original_minimum = get_minlikeindex(
+        results_np, like_index=1, verbose=False
+    )
+
+    # Run the new get_minlikeindex_pandas function
+    new_index, new_minimum = _get_minlikeindex_pandas(
+        results_pd, like_index=1, verbose=False
+    )
+
+    # Compare the results from both methods
+    assert (
+        original_index == new_index
+    ), f"Index mismatch: {original_index} != {new_index}"
+    assert np.isclose(
+        original_minimum, new_minimum
+    ), f"Minimum value mismatch: {original_minimum} != {new_minimum}"
+
+    print("Test passed! Both methods return identical results.")