Preliminary analysis of TCM syndromes in the various groups indicated that pathogenic dampness （internal retention） Zheng was universali in the A group （ who were just diagnosed with no treatment）

B group （5 - 6 years after diagnosed without good control） and C group （ over 10 years after diagnosed without good control）. It is suggested that internal retention of pathogenic dampness is greatly related with protracted course of diabetes; Yin - deficiency in patients at early stage are universali; Blood stasis is commonly seen in the patient with over 10 years duration of illness and no good control. It is indicated that it is necessary in TCM treatment of diabetes to pay close attention to removing pathogenic dampness at any time

and to nourishing Yin and protecting Yin at the early stage

and to removing blood stasis for over 10 years duration of illness.