Hi,

I use the corrected for background results, i.e. the second row of results. 

Thanks.

Is there any condition like Rwp>Rp?

The Conventional Rietveld R- values (background corrected) are percentages.

Thank You Ian J Slipper.

I have another question. In most of papers i have seen that Rwp value is greater than Rp. Is it a condition? 

To all concerned with this, please read the attached paper

Article R Factors in Rietveld Analysis: How Good is Good Enough

Chi^2 = 3.34, at least < 2 confirmed with graph. what is the space group?

Simply go through the sum text file in the folder where you have your .pcr file. You will find everything you need there.