The law of conservation of momentum is com mon in the nature of law and has a broad application field , applies not only to macroscopic movement of the object ,also apply to the micro field . In current textbooks of most , however ,are all derived from Newton′s second law and the law of Newton′s third law of conservation of momentum ,it can make people ignore other export momentum conservation .This paper tries to expound several different ways of export of conservation of momentum ,strengthen the awareness of the law of conservation of momentum and the application .%动量守恒定律是自然界中最普遍的定律并有着广泛的应用领域，不仅适用于宏观物体的运动，同样适用于微观领域。不过，在目前的大多数教材中，都是由牛顿第二定律和牛顿第三定律导出动量守恒定律的，那么就会让人们忽略动量守恒定律的其他导出方式。试图阐述动量守恒的几种不同导出方式，强化对动量守恒定律的认识和应用。
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