Passport spoiled, have to redo but the Visa haven't expired, what should I do?

My maid had put my passport into washing machine causing it wet and spoiled. Immigration officer asked us to replace a new passport. But my entry permit to China still available until next year. What should I do? Can I still get back the Visa like previous? Or I need to reapply? How long the process will take and how about the charges fee? Thanks in advance.