According to the several terms of <RULES FOR THE ADMINISTRATION OF EMPLOYMENT OF FOREIGNERS IN CHINA>:

Foreigners should be required by the employer, engaged in technical, management, or lack of appropriate candidates requires special skills, and  foreigners can not violate the relevant laws and regulations in China. 

According to the several opinions of <RULES FOR THE ADMINISTRATION OF EMPLOYMENT OF FOREIGNERS IN CHINA>:

1. Healthy, suffering from mental disorder, leprosy, AIDS, venereal diseases, open tuberculosis and other infectious diseases, as well as during labor contract period can not be suffered from heavy disease;

2. Have a legal labor contract from china company

3. Have professional skills,and corresponding qualifications, more than two years working experiences

4. No criminal record

5. Have a valid passport or other international travel credentials can replace passport

6. Men generally 18 to 60 years old; Women generally 18 to 55 years old.