There are different requirements on different types of multiple-entry visa application:
What do you come to China for, sightseeing or business visit?
To apply for a Multiple Entry (L) Visa, the applicant shall meet the following requirements:
(1) The applicant is the husband/wife, or son/daughter, or parent of a Chinese citizen residing in Mainland China. Please submit proof of relationship, e.g. the original and the photocopy of a marriage certificate, a notary certificate of kinship etc. or,
(2) The applicant owns real estate in China. Please submit the original and a photocopy of the property ownership certificate.