Dear Alan,
Thank you very much in advance, actually i've tried to calculate the resolution from opening the netcdf file, at first i thought that it doesnt make sense because the resolution is 0.204 i thought i calculated it wrong. but any way thank you very much, and actually i asked the question about the resolution, because i tried to regridding it into 0.25 degree, and then i want to compare the CFSV2 precipitaion data with TRMM 3B42 data, by (TRMM-CFSV2) but somehow, the plot a little bit weird.