"We will make rational arrangements regarding IPO approvals in order to insure a smooth transition from the approval system to the registration-based system," CSRC spokesperson Deng Ge said at a regularly scheduled news conference on Friday.

Deng also said that companies planning to list will need at least half a month to prepare their applications to meet new regulations on listings published in December.

CSRC said it is drafting rules for the migration to the U.S.-style registration-based IPO system and will publish them when the time is right.

(Reporting by Sam Shen and Pete Sweeney; Editing by Kim Coghill)