Can I return to China for development with a Canadian green card?

You can go back to China after you get Canadian permanent resident status, but you must ensure that your identity will not be lost because you don't go back for too long. No separate visa is required for returning to China. It's okay to go back to China to find a job. As far as China is concerned, there is no time limit. You are still from China and enjoy the same rights and benefits. However, if you are naturalized, you will become a foreigner in China, and there are special regulations on employment and insurance, which will be more troublesome.

In the long run, I suggest that you try to keep your status in Canada and don't lose your permanent resident status. After all, it is not easy to get.