Abstract: Objective　To study the risk factors of childhood functional constipation. Methods　A cross-sectional analysis of risk factors associated with 182 cases of functional constipation in children was conducted from March 2013 to February 2014. Results　The male patients were more than females, mainly in preschool children. The risk factors were did not like fruits and vegetables (52.2%), drank less water (44.0%), did not develop the habit of daily bowel movement (39.5%), defecation fear (36.3%), inadequate food intake (25.8%). There were different risk factors in different age stages. Conclusions　Functional constipation is related to gender, age, diet habits and mental psychology.