The surface tension and surface absorption of a new surfactant, the 3-alkoxy-2-hydroxypropyl trimethylammonium bromide, have been investigated by drop-volume method at different temperature. Some thermodynamic parameters were calculated according to corresponding formula. 用滴体积法测定了不同温度下新型阳离子表面活性剂3-烷氧基-2-羟基丙基三甲基溴化铵的表面张力,根据有关公式,计算出不同温度下的表面吸附量和热力学函数的变化值。