Is there a way to prevent iOS6 to kill the specific task process?

Question

I know that iOS has its own task management method and users may never need to care about the processes background. But my requirement is to ALWAYS keep a program alive, it

Answer 1

No, that's not possible. (Nor should it be if you think about it. What's to stop every app from saying that it can't be killed?)

The closest you can get is for things like VoIP apps that do run in the background and automatically respawn when they die.

The alternative is to work like every other app: when your app goes into the background you save state so you can restore if it gets killed. iOS 6 even has the state restoration functions.