It means you can stay in China until 2014, 4, 8. No matter how many times you come back before this time, it will not be affected. After this time, it needs to be extended. (See what certificate is signed) If there is no need to renew the fee, check in after 4 or 8 days 180 days, and renew the fee after 180 days. The corresponding visa can only stay in one place. Hongkong and China have different visas. You can't go from China to Hongkong with this visa.