I want to stay in hongkong for 1 or 2 years, how to make a visa, now I live in korea

What's the purpose of coming to HK, for a job, a study, a visit etc?

for visit

You can submit your application to the local Chinese embassy or consulate. They will send your application to HK for approval. So, the processing takes about 4 weeks. You can refer to http://www.immd.gov.hk/en/services/hk-visas/immigration-entry-guideline.html for details.