Professor Meng Ru explores unceasingly in near 50 year Clinical diagnosing and treating professions,strives for newly,by the rich experience,the unique clinical diagnosing and treating mentality and the method,manifedsted own academic thought and the style.has the achievement especially,with autoimmune diseases integrative of Chinese and Western medicine diagnosing and treating aspect.This article from six aspects to its academic thought's origin,the diagnosing and treating mentality and the experience characteristic to the analysis and the explain.