Objective     To design a prodromal questionnaire (PQ) for screening psychosis in young soldiers and to test its reliability and validity.  Methods      Based on published articles and specialists’ consensus

we established a preliminary version of PQ for psychosis screening. A final version of questionnaire was made after carrying out a trial of small samples. By cluster sampling

the PQ for psychosis and PQ-16 scales were administrated to 2 500 subjects among soldiers and students of military university. By random sampling

100 subjects were tested for the second time after 8 weeks. Data from 2 143 effective questionnaires were analyzed by descriptive statistics and structural analysis

and its reliability and validity were investigated. Results      Four factors

i.e. cognitive change

behavioral change

social function change and personality change

were found by exploratory factor analysis. The value of factor loading ranged from 0.291 to 0.578. The internal consistency reliability was 0.957(P0.05). The test-retest coefficient was 0.884(P0.01). The correlation coefficient of the questionnaire with PQ-16 was 0.830. Conclusion      The results show good reliability and validity of the PQ for psychosis screening. It can be a useful tool for screening the mental health status of young soldiers.