The influence of benzene and acetone on the liquid-crystal structure of phosphatidylethanolamine(PE)was investigated respectively by method of the small angle X-ray scattering(SAXS).The experi-ments showed that the benzene enabled the tie of PE in liquid-crystal state to change from lamellarphase into cubic phase,then induced it from cubic phase into hexagonal phase,and finally to impel itchanging from hexagonal phase into liquid state.Meanwhile,in this phase transition of the tie removalappeared the red shift. Besides, the acetone was also capable of removing the tie of PE in liquid-crystal state from lamellar phase into cubic phase. Again,the red shift appeared in these transitions of the tie. However, when PE in liquid-crystal state was induced into hexagonal phase, the acetone was unable to impel it from hexagonal phase into liquid phase like benzene, but stabilized it only in hexagonal phase.