question about VISA validity it's important give me right suggetion.

Hello to all,
My question is that, now I am staying at China, I am coming here on 180 days VISA permit. I am coming in china on 17th December 2014 in Morning and my visa is valid for 180 days. Actually I have booked my flight tickets on 15th June 2015 and flight at night. So can I stay here in china upto 15th June 2015. So can anyone tell me any solution for that. But one thing is that already I have got temporary resident permit from Chinese Police Department. This resident permit is until valid for 15th June 2015. They give me that permit for until valid for 15th June 2015. I don't have any Idea about that and I am very worried about that because it's my first time for I am travel outside off my own country and I don't have enough knowledge about that. So can anyone give me good suggestions what can I do in this situation.?