Objective:To study the validity of MMPI in police recruitment.Methods:9096 police applicants had been tested with MMPI from 1989 to 2004.Results:1694 male applicants were not accepted, they got higher MMPI(Chinese version) T-scores on scale Hs(61.9?10.0/45.4?6.6,t=8.76), Pa (61.6?12.7/46.6?8.1,t=5.85), Pt (58.7?10.1/43.3?7.6,t=6.45), Sc (65.4?7.8/44.6?6.6,t=11.46), and Ma, so did the female ones on scale Pt (60.9?3.7/42.2?8.2 ,t=3.79), Sc (68.9?3.0/45.2?8.2,t=4.96), and Ma (63.5?4.1/50.1?9.2, t=2.48). After a 16-year follow up, the results showed that in the group enrolled, none had suffered mental illness. 43 out of 70 applicants who were not accepted during 1989 to 1990 were investigated. Two of them had been sent to psychiatric hospital for schizophrenia.Conclusion:Result of MMPI is valuable in police recruitment.

For developing the determination method of chromium picolinate in health food by HPLC,extraction method and HPLC operation conditions such as columns,mobile phase had been optimized.Long term stability test of chromium picolinate had been done.Recovery of the standard spiked >93%,the RSD was 3.1,the lowest detection limit was 10.0 mg/kg,the result fits the demand of the analysis of health food.This method can be used in analysis of the content of chromium picolinate in types of tablet and capsule health food.2 years store experiment in room temperature showed that chromium picolinate was stable.