采用固相反应烧结法制成了钙钛矿（Ｌａ１－ｙＴｂｙ）０．６７Ｓｒ０．３３ＭｎＯ３（ｙ＝０—１）多晶样品．研究了样品的微观结构，常温、低温下的磁性，样品的磁电阻随温度、成分的变化关系，电阻随温度变化特性等．并在ｙ＝０４０样品中，１７０Ｋ附近、最大磁化场为７Ｔ时，观察到了９００％的巨磁电阻 A polycrystalline sample of perovskite (La1-yTby) 0.67Sr0.33MnO3 (y = 0-1) was prepared by solid-state reaction sintering. The microstructure, the magnetism at room temperature and low temperature, the change of the magnetoresistance of the sample with the temperature and the composition, the change of the resistance with the temperature and so on were studied. And in y = 040 samples, 170K in the vicinity of the maximum magnetization field of 7T, the observed giant magnetoresistance of 900%