Soben,
Yes, as canada1234 said, it's perfectly fine.
The following text is taken from CIC website:
Keeping your permanent resident status
Your permanent resident status allows you to live in Canada, but there is also a time limit on how long you can live outside the country. To keep your status as a permanent resident, you must live in Canada for at least two years within a five-year period.
Check this link to CIC website for additional information:
http://www.cic.gc.ca/english/newcomers/about-pr.asp#keep_status
soben said:
Hi,
me, my wife and my daugter are PR holders from august 2011.(almost 10 months)
i am planing to go back to my home country for 3 months (from june 22 and coming back on sept 15)
is it OK ?