Kind of difficult to answer such a question. China is a country of rules upon rules with exceptions, an absolute morass of mind-numbing bureaucracy that even the locals cannot understand. In order to answer you in a form that is helpful, you need to tell us things, like nationality, age, education, number of children, work experience etc. Put it this way, if your spouse has a college degree, is fluent in English and preferably have some sort of work experience, she can easily get a Z visa. If not, I do believe she can get a visa as your dependent but she would not be allowed to work. However, the rules are strange and muddled.