Finally I got a solution for it. Blackberry simulator's keep the data in its working directory in three files named (for BB 9530 simulator):
9530-as.dmp
9530-fs.dmp
9530-nv.dmp
9530-fs.dmp
9530-nv.dmp
Usually file names are [model name]-*.dmp.
For my pc for model 9530 verizon keeps the file in its working directory:
C:\Program Files\Research In Motion\BlackBerry Smartphone Simulators 4.7.0\4.7.0.75 (9530-Verizon)\
If we need to clear this data just simply delete among three files.