You must register your place of residence with the local Public Security Bureau within 24 hours of arrival. Chinese authorities enforce this requirement with regular spot-checks of foreigners’ documentation. If you are staying in a hotel, registration is done on your behalf as part of the check-in process.
The Shekou Police in Shenzhen have requested all eligible foreign nationals to register their places of residence before 17 June 2016. Failure to do so may result in heavy fines being imposed and/or detentions.