A foreign national holding a D, Z, X or J-1 visa should initiate residence formalities with the Entry and Exit Administration Department of Hengyang Municipal Public Bureau within 30 days of his or her arrival in China.  
A foreign national who is taking up employment and filling a position in China should initiate residence formalities with the Entry and Exit Administration Department of Hengyang Municipal Public Security Bureau by presenting his or her "Z" visa and his or her "Alien Work Permit" issued by the labor authority or "Foreign Expert Certificate" issued by the Foreign Experts Bureau.  
To obtain a residence permit, the applicant should answer all questions asked and provide the following documents: 

1. The original and one photocopy of his or her valid passport and visa;  
2. Completed Foreign National Visa and Residence Application Form, with a recent 2-inch photo attached (full face without hat);  
3. The Overseas Personnel Temporary Accommodation Form issued by the local police station (this requirement is not applicable to those staying in international student buildings on campus and hotels);  
4. An original Health Certificate issued by Hengyang Entry-Exit Inspection and Quarantine Bureau;  
5. Other certification and documentation required for residence.  

The following foreign national are exempted from employment permits 

1. Foreign technical and managerial personnel directly recruited and paid by the Chinese Government and those who are recruited and paid by national authorities and institutions, possess advanced technical qualifications or special skills certificates issued by a national or international authoritative technology administration agency or industry association, and hold a Foreign Expert Certificate issued by the Foreign Experts Bureau; 
2. Laborers of foreign nationalities who hold a Permit for Foreign Nationals to Engage in Offshore Oil Operations in the People`s Republic of China, those engaging in offshore oil operations do not need to come ashore but must possess special skills;  
3. Foreign nationals who hold a Temporary Commercial Performance Permit issued by the Ministry of Culture and who are engaged in commercial cultural performances. 

Note: 
A foreign national who wishes to stay or reside in China after his or her visa or residence permit expires should apply for an extension of said visa or residence permit before it expires.  
During his or her residence in China, if a foreign national is found to carry a disease which would have disqualified him or her from entry into China, the Chinese health authority may request the public security authority to order the foreign national to leave China before said residence permit expires.  
A foreign national who has settled down in a certain area in China and wishes to relocate elsewhere in China should apply for a relocation approval with the public security bureau of his or her intended destination, and complete the relocation formalities according to the procedures set forth in the preceding paragraph.  
To protect national security, public order or other public interests, public security bureaus at the city and county levels may prohibit foreign nationals and foreign organizations from setting up residences and offices in certain areas.  
Parents of a foreign baby born in China or their appointed agent should initiate registration formalities with the local public security bureau by presenting the baby`s birth certificate within one month of the baby`s birth.  
The family of a foreign national who dies in China or the appointed custodian or their agent, should present the death certificate and surrender the residence permit or visa of the deceased to the local public security bureau within three days of the death.  
Foreign nationals aged 16 and upwards who stay or reside in China should carry the originals of their residence permits or passports with them at all times and present them for inspection when required to do so.  

Changes of Residence Permits & Other Instructions 
1. In the event of any change to the statement of justification for residence, passport number, residence address and the accompanying family, the holder of the residence permit should apply for a new residence permit with the Entry and Exit Administration Department of the Municipal Public Security Bureau within 10 days of the occurrence of said change.  
2. In the event of any change to residential address, attending school, job position or employer, the holder of a residence permit should initiate formalities for such change with the Entry and Exit Administration Department of the Municipal Public Security Bureau within 10 days of the occurrence of the change.  
3. To relocate elsewhere, the holder of a residence permit should initiate relocation formalities with the Entry and Exit Administration Department of the Public Security Bureau in his or her current city or new destination within 10 days of his or her relocation.  
4. Foreign nationals who are terminating their studies or employment in Hengyang for any reason should surrender their residence permit and obtain the relevant visa immediately.  
5. Foreign nationals who hold a residence permit may reside in China or undertake multiple entries into and exits from China within the stated validity period of their residence permit.  
6. Employers may apply for residence permits for their employees. However, first-time residence permit applicants should apply in person. 

（http://english.gov.cn/services/live_in_china/2014/08/23/content_281474983007062.htm）