Objective To find out syndrome distribution of late menstruation patients to lay foundation for the standardization of syndrome differentiation. Methods Cross sectional study of clinical epidemiology was used. 207 late menstruation patients among 1016 functional uterine bleeding patients were surveyed by questionnaire and frequency of each syndrome were counted. Results Among 207 patients, the total of 501 syndromes appeared, with 118 spleen deficieny, 97 Kidney Qi deficiency, 69 liver Qi stagnation, 60 kidney Yin deficiency, 59 blood heat( ex...