It is found that the current amplification coefficient strongly depends on the spin polarization of the electrons injected from the emitter to the base , the spin relaxation time and the width of the base 自旋晶体管中的电流放大系数主要取决于注入基区的自旋极化电子的极化程度,基区中自旋的驰豫时间及基区的宽度。