好像是这个? http://moscow.usembassy.gov/russian-visas.html Visa Registration: Travelers who spend more than seven days in Russia must register their visa and migration card through their sponsor (at the local Federal Migration Service (FMS)) or landlord (at the local post office or FMS). Travelers staying in a hotel must register their visa and migration card with their hotel within one day. Even travelers who spend less than seven days in one place are encouraged to register their visas. If a traveler chooses not to register a stay of less than seven days, he or she is advised to keep copies of tickets, hotel bills, or itineraries in order to prove compliance with the law.
http://moscow.usembassy.gov/russian-visas.html
Visa Registration: Travelers who spend more than seven days in Russia must register their visa and migration card through their sponsor (at the local Federal Migration Service (FMS)) or landlord (at the local post office or FMS). Travelers staying in a hotel must register their visa and migration card with their hotel within one day. Even travelers who spend less than seven days in one place are encouraged to register their visas. If a traveler chooses not to register a stay of less than seven days, he or she is advised to keep copies of tickets, hotel bills, or itineraries in order to prove compliance with the law.