This study is validity study of the questionnaire for doctors for Sasang constituion diagnosis. (an objects of this study : 314 patients) We analyzed the results of questionnaires about 314 patients who were diagnosed in Department of Sasang Constitutional Medicine from June to November, 2004. The questionnaire for doctors consists of objective valuation about the patients for Sasang constituion diagnosis. In the analysis about all variables, we obtain the diagnosis accuracy of 92%. In the analysis about body type variable, we obtain the diagnosis accuracy of 44-48%. In the analysis about external appearance, mental characteristics, physiology & pathologic symptoms variables, we obtain the diagnosis accuracy of 46-72%. After all, in order to increase of the diagnosis accuracy, we have to analysis total variables(body type, external appearance, mental characteristics, physiology & pathologic symptoms) for sasang constituion diagnosis. Hereafter, We need many data and standardization for sasang constituion diagnosis.