diff --git a/OrbitUtils_Tests/Bunch_Util_Tests/bunch_with_microsize_particles_attr.py b/OrbitUtils_Tests/Bunch_Util_Tests/bunch_with_microsize_particles_attr.py
new file mode 100644
index 0000000..d062524
--- /dev/null
+++ b/OrbitUtils_Tests/Bunch_Util_Tests/bunch_with_microsize_particles_attr.py
@@ -0,0 +1,57 @@
+##############################################################
+# This script tests set the macrosizes to bunch or particles
+##############################################################
+
+import math
+import sys
+import time
+
+from bunch import Bunch
+
+print "Start."
+
+#------------------------------
+#Main Bunch init
+#------------------------------
+
+nParticles = 5
+bunch = Bunch()
+(x,xp,y,yp,z,dE) = (0.,0.,0.,0.,0.,0.)
+for ind in range(nParticles):
+	bunch.addParticle(x,xp,y,yp,z,dE)
+	
+#---- The macro_size for Bunch instance
+#---- after that each added or exiting macro-particle in the bunch
+#---- will have a charge of 1000 electrons. So, If you add a macro-particle
+#---- to bunch, you will increase the total charge of the bunch.
+#---- 1.602176634e-19 - charge of 1 electron (abs. value)
+macro_size = 1000*1.602176634e-19
+bunch.macroSize(macro_size)
+print "================init bunch==============="
+bunch.dumpBunch()
+print "========================================="
+
+#---- add particles macrosize attribut
+#---- after that macro-particles can have different macro-sizes.
+#---- by default the value is zero.
+#---- After you setup macrosize attribute to particles any space-charge will be 
+#---- defined by these macrosizes, the clobal macro-size for the bunch object 
+#---- will be ingnored.
+bunch.addPartAttr("macrosize")
+print "================bunch with macrosize=0 particles attribute ==============="
+bunch.dumpBunch()
+print "=========================================================================="
+atribute_array_index = 0
+for ind in range(nParticles):
+	#---- set macrosize for particle with index=ind
+	macro = macro_size*ind
+	bunch.partAttrValue("macrosize", ind, atribute_array_index, macro)
+  #---- get macrosize for particle with index=ind
+	new_macro_size = bunch.partAttrValue("macrosize", ind, atribute_array_index)
+	print "ind =",ind," size=",new_macro_size
+	
+print "================bunch with macrosize particles attribute ==============="
+bunch.dumpBunch()
+print "=========================================================================="
+
+print "Stop."