By studying on the Physiological,Pathologic and immunogenetic characteristics of phlegm damp constitution.The results showed that the HLA A 11 ,HLA B 40 frequencies of phlegm damp constitution was obviously higher than that of human people,which implied that there was a immunogenetic basis of fat people's phlegm damp constitution.The results also showed that there were close relations between phlegm damp constitution and may diseases.These results could be used as the criteria for human physique type classifying and phlegm damp costitution differentiation.