You won't need it for the interview. Later on you will need the criminal report in order to get your Crew Pass (Airline ID Badge). Normally phase 1 is Interview, medical, ATPL test. Phase 2 is CAAC Check. Phase 3 is start class and bring with you the criminal report. The time from Phase 1 to phase 3 can be as fast as 4 to 5 months or as long or longer than 1 year depending upon the airline, CAAC, Relationships and how many Red envelopes are exchanged.