i am from U.A.E. ... so , what kind of medical certificate is required for work Z visa of china ???

Here is a standard physical exhimization record for your reference: https://www.travelchinaguide.com/embassy/pdf/physical.pdf
Please note that if the embassy donot ask for it when applying for the visa, you can do it after arriving in China. Also, some embassies have designated hospitals for the exhimization. Thus, I recommend you to contact the China embassy in UAE for further confirmation before doing it.