The main purposes of this survey research were to : 1) Compare the psycholgical traits of the Thai people living in Villaes with high  stage of development and low stage of development. 2) Compare the levels of modernized behaviors of these two groups of people. 3) Compare the psychological traits of people having different levels of modernized behaviors. 4) Find out the psychological traits of people living in Villages with different stages of development and having different levels of modernized behaviors. The psychological traits in this study were mental health, social experiences, locus of control, attitudes toward positive behaviors, achievement motivation and future-orientation and social control. 
                The samples in the study were divided in to 2 groups, one group was people living in villages under development project having high level of development and won the village contest. Anather one was the group of people living in villages with low level of development. Each group of the samples consisted of 180 subjects. 
               The samples were tested by 3 sets of  instruments : The questionnaire collecting the basic data of the samples, the instrument to measure the psychological traits and the instrument to measure the levels of modernized behaviors. The data were analyzed and the main results came out as follows : 
                1)  People living in villages with high level of development had higher level of psychological traits. 
                2) People living in villages with high level of development had higher level of modernized behaviors. 
                3)  People with high level of modernized  behaviors had higher level of psychological traits, except mental health. 
                4)  By the interaction between the level of development and the level of modernized behaviors, mental health was found to be correlated with attiudes toward positive behaviors and locus of control. 
                5)  People having high level of partcipation in group activity had higher level of psychological trats.