The purpose of this study was to develop a personality test for junior high school students. The results of this test can be used for guidance, counseling, and research. This test is a kind of semi-projective tests and designed some sentence roots for students to complete sentences. There were 35 sentence roots in the test. All the sentence roots were screened from students' weekly records. The scorer reliabilities for the 35 sentence roots ranged from .7012 to .8971. The test-retest reliabilities were .4520 for positive reaction, and .6407 for negative reaction. There were three validity tests:(1). The comparisons of differences between the students with good adaptation and bad adaptation on positive reaction and negative reaction. The results showed that there was no difference between the students on positive reaction, but the students with good adaptation had lower scores of negative reaction than those of the students with bad adaptation.(2). The comparisons of differences between the students with good scholastic record and poor record on positive reaction and negative reaction. The results showed that there was no difference between the students on positive reaction, but the students with good scholastic record had lower scores of negative reaction than those of the students with poor record.(3). The twelve subtests of Lai's Personality Test were used as criterions, and the criterion-related validities were demonstrated satisfactory. In order to explain the results of the test, 3657 subjects drawn from 25 junior high schools were served as the standardization sample to establish the male, female and whole students of the three grade's percentile norms.