Thank you guys. The problem was the memory leak after the use of system care. i just try to uninstall it and see how memory usage. The memory usage become stable and now the system is running in normal condition. I think the memory leak issue is resolved.
Guys i have installed advanced system care 15 pro. Now my system ram usage decreased. I think memory leakage is there but i can't figure out where it happening. If i uninstall the system care the memory usage gone increase rapidly. I don't know what to do actually.