diff --git a/ObservationSim/Instrument/Chip/Effects.py b/ObservationSim/Instrument/Chip/Effects.py
index c289abc0e6da213b703e9363997f195ef2bbc15f..7a6b7a667c15e5ff8bf5d740e63476cd597531d0 100644
--- a/ObservationSim/Instrument/Chip/Effects.py
+++ b/ObservationSim/Instrument/Chip/Effects.py
@@ -613,11 +613,11 @@ def selectCosmicRayCollection(attachedSizes, xLen, yLen,cr_pixelRatio,CR_max_siz
     return   CRs[0:cr_event_num];
 
 
-def defineEnergyForCR(cr_event_size):
+def defineEnergyForCR(cr_event_size,seed = 12345):
     import random
     sigma = 0.6 / 2.355;
     mean = 3.3;
-
+    random.seed(seed)
     energys = np.zeros(cr_event_size);
     for i in np.arange(cr_event_size):
         energy_index = random.normalvariate(mean,sigma);
@@ -677,7 +677,7 @@ def produceCR_Map(xLen, yLen, exTime, cr_pixelRatio, gain, attachedSizes, seed=2
     cr_size = selectCosmicRayCollection(attachedSizes, xLen, yLen, cr_pixelRatio, CR_max_size);
 
     cr_event_size = cr_size.shape[0];
-    cr_energys = defineEnergyForCR(cr_event_size);
+    cr_energys = defineEnergyForCR(cr_event_size,seed = seed);
 
     CRmap = np.zeros([yLen, xLen]);
 
diff --git a/requirements.txt b/requirements.txt
index 12b61a25ad92dc287b5f8d10e1a44370689e6895..6128cf4f1b8656da6e29ef0bd3de57c6268cadf8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,6 @@ astropy==6.0.1
 scipy==1.11.4
 GalSim==2.5.2
 PyYAML==6.0.1
-mpi4py==3.1.6
 sep==1.2.1
 healpy==1.16.6
 h5py==3.11.0