I am venus working in hongkong. i want to visit mainland for 1 day only. how to get visa?

Venus, you should go to the Commissioner Office of the PRC Foreign Affairs Ministry and submit the the following materials: a valid passport, a photocopy of the info page of the passport, an application form attached with your recently taken bareheaded color photo, the original and photocopy of your residence permit in HK, and round-trip tickets and hotel reservations. If you come to mainland for the first time, you should also submit your work certificate or financial standing proof.