I am a Hong Kong resident and have HK id card, how can I apply for for my wife who is from China.

Oh, the processes are complicated.
Your wife need to apply for One-way Permit first. The application requirement is that your related scores should be reach to around 150. Different places have different requirements. The application will be completed in half a year. After having this permit and completing settlement procedures, your wife needs to live in HK for 7 years. Then she is qualified for applying for HK ID Card.