To investigate the distribution of TCM constitutions in elderly patients with type 2 diabetes mellitus and sarcopenic, and to explore the relations between constitutions and chronic diseases and life habits.Methods:A total of 229 cases were enrolled in this study, using the method of TCM scale and the sociology of population characteristics, other combined chronic diseases, diet, exercise, sleep and other life style.Results:The number of gentleness type and biased constitution was 22 (9.61%) and 207 (90.39%). The sequences of constitutions were Qi-depression (22.71%), Yang-deficiency (22.27%), Qi-deficiency (13.97%), Blood-stasis (13.97%), gentleness type (9.61%), dampness-heat (9.17%), special diathesis type (4.80%), and phlegm-dampness (3.49%). There was a significant difference in constitutions between the elderly patients with chronic disease and without the same chronic disease (P<0.05). For example, TCM constitutions of hypertension was mainly manifested as Qi-depression (32.84%) , Yang-deficiency (20.90%), Qi-deficiency (17.91%); hypothyroidism was mainly manifested as dampness-heat (25.00%), blood-stasis (22.73%), Qi-depression (22.73%); ptosis of the stomach was mainly manifested as Yang-deficiency (29.52%), Qi-depression (27.62%), Qi-deficiency (21.90%); coronary heart disease and heart infarction was mainly manifested as with blood-stasis (30.61%), Qi-deficiency (22.45%); stroke was mainly manifested as blood-stasis (26.92%), Yang-deficiency (21.15%), Qi-deficiency (19.23%). There were differences in diet intake, exercise habits and sleeping habits between the elderly patients with biased constitution and the elderly patients with gentleness constitution (P<0.05).Conclusion:The constitution type of elderly patients with type 2 diabetes mellitus and sarcopenic was related to chronic diseases and life habits. The prevention and treatment of chronic diseases should take care of the physical characteristics and the TCM constitutions.