Can Sony xperia z3 work normally?

Do you mean normal use in Chinese mainland? Yes, you can. The Japanese version Z3 sold online is unlocked (you can buy it yourself in Japan), and the ROM memory configuration is higher, and its functions are basically the same as those of Bank of China. Internet, telephone, SMS, signal, camera, etc. Everything is fine. Only a few services related to docomo (Japanese operator) cannot be used. Network standards better support China Unicom.