Abstract In order to understand the present trends and major fields of military psychology, this article analyzed literatures which were collected from the conference of the International Military Testing Association during 1980 and 2009. We extracted key words from the papers or the reports to do word frequency analysis. The results show that the most of literatures(85.7%) may be divided into seven fields as follows: military personnel training, job analysis of military occupation, psychology selection of military personnel, military leadership and organizational behavior, measurement theory and technology, military human factors, and military clinical psychology. The frequencies of training /education, performance, selection and job analysis are high(above 58.0%) in literatures during 1980 and 2009. The frequencies of selection, leadership, performance, job analysis, turnout and human factors are high (above 70.2%) in literatures during 2000 and 2009. Military Psychology is an applied science with a variety of complex fields, in which psychological selection of military personnel, military leadership and organizational behavior, military clinical psychology are now being paid more attention. Key words IMTA, military psychology, word frequency analysis