自2008年10月1日起,凡办理各类外国人签证申请和各项居留许可业务(包括申请延期与变更),均需携带有效境外人员临时住宿登记单原件并提交复印件一份(住宿登记单右上角须有统一编号,编号由英文字母和数字组成)。
From the 1 Oct.2008 on,any applicant either for visa or residence permit (including for extension and alteration) should hold a valid and original Registration Form of Temporary Residence,and submit a copy of it.(The registration form must bear a serial number which composed of English letters and numbers at the top right corner)
(来自公安部网站)