Abstract: To find out the mental health of construction industry practitioners，952 construction industry practitioners were subjected to a test by means of SCL-90 questionnaire. Results: 1. There finds no significant difference in different groups；2. The scores in terms of four factors of SCL-90 in the group under the age of 18 are found higher than those from the other groups; 3.The scores in terms of two factors of SCL-90 in the group that receive merely a Primary education are higher than those from the other groups. The state of mental health of construction industry practitioners was good，yet there exist certain differences among different groups.