To study the distribution regularity of TCM constitutional types in androgenetic alopecia (AGA) population and analysis the characteristics of different social demography population through investigation of TCM constitutional types in AGA population. Methods:Adopting the method of questionnaire issuing from October 2011 to July 2012 in seven regions. Using the standardized Constitution in Chinese Medicine Questionnaire (CCMQ) to evaluate the scores of all kinds of Constitutional types (Gentleness type, Qi-deficiency type, Yang-deficiency type, Yin-deficiency type, Phlegm-wetness type, Wet-heat type, Blood-stasis type, Qi-depression type, Special diathesis type). Application Discriminant Analysis to distinguish the individual Constitutional types, and analysis the distribution regularity of constitutional types of Chinese medicine in AGA population. Results: Totally 2084 subjects were interviewed and 2014 completed the questionnaires (the response rate 96.8%). Among all subjects, 1261 cases were male while 753 cases were female. In the AGA population, Gentleness type accounted for 56.70 percent, eight pathological constitutions accounted for 43.30 percent, and the former four types of eight pathological constitutions were Yang-deficiency type (12.51%), Wet-heat type (9.14%), Qi-depression type (6.11%) and Yin-deficiency type (5.56%). Simple constitution accounted for 44.34% while mixed constitution accounted for 55.66%. The male percent with Gentleness type is significantly higher than that of the female. The former two pathological constitutions types in male were Wet-heat type and Yang-deficiency type; the former two pathological constitutions types in female were Yang-deficiency type and Qi-depression type, and the difference is significant. The composition ratio of constitutional types in different geographical regions was different. Among seven regions, the proportion of Gentleness type in Dongbei was the lowest, the proportion of Yang-deficiency was higher in Dongbei and Huanan area, the proportion of Wet-heat type was higher in Dongbei, Huazhong and Huadong area, the proportion of Qi-depression type was higher in Dongbei and Xinan. Conclusion: In the AGA population, eight pathological constitutions accounted for 43.30 percent, Yang-deficiency type, Wet-heat type and Qi-depression type are common seen in AGA population. The composition ratio of constitutional types in different geographical and sex is different.