I have got Visa for travling to china.the validity of the visa is until 25June2013

My passport is invalid after 1 October 2013, because of different programme rearrangement I will go around 20 June 2013 or even After 25 JUne 2013.
1. Is my passport working if I go to visit before 25 JUne2013 ? the passport is invalid after 1 October 2013,but I have valid one for entering before 25 June.
2. If the progerame is not arranged before 25 June 2013,how I will renew it, as a new application ?