Objective To explore the tridimensional personality characteristics of heroin addicts and the relationship with their mental state.Methods The personality character of 113 general adult and 100 heroin addicts were tested with tridimensional personality questionnaire(TPQ),and the mental state for the heroin addicts were tested with symptom of check- list(SCL-90) and to contrast the consequence with the norm of Chinese.Results NS and HA scores in heroin addicts( ( 18.07 ±4.13),( 16.06 ± 5.13) ) were higher than those in normal control group( ( 16.22 ± 4.88),( 13.98 ± 6.11 ) ) (P ＜ 0.05 ),and RD scores ( 17.22 t 3.18 ) was lower than that of the control group (18.27 ± 3.73 ),the difference was statistically significant (P ＜ 0.05 ).The total score of SCL-90 and 9 factors score of heroin addicts were higher than the national norm,the difference was statistically significant (P ＜ 0.01 ),in which somatization,obsession,depression and psychosis were more prominent ; HA scores in heroin addicts were positively associated with the factors including obsession,interpersonal relation sensitivity,depression and positive project number.The Pearson correlation coefficient were respectively 0.226,0.243,0.201,0.215,the difference was statistically significant (P＜ 0.05).Conclusion The personality characteristics of heroin addicts is special and is correlated with their mental health state.