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I have two b2dworlds created by RUBE and I exported their corresponded json files. I loaded the b2dworld A's json file to create my world in my project, and now I want to import a character which has some bodies, fixtures and joints from b2dworld B to A. Is there some easy method to do this? Please give me some advices, thx

The most straightforward way is to modify the readFromFile function to load bodies into an existing world, instead of creating a new one. For this, you will need to pass the existing world to the function, like this:

readFromFile(const char* filename, string& errorMsg, b2World* world)

There are just a few lines of code you can change to make this happen. This thread here outlines the changes, although it may be a bit hard to follow: viewtopic.php?f=6&t=125
If you need more explanation/help, just let me know.

I followed your method, and now it works!!! Thank you!