Based on the quality of linear operation about indefinite integral, the article puts forward an indefinite integral principle of making linear combination and reducing power of integrand.

• 从不定积分的线性运算性质出发,给出了计算不定积分的被积函数线性组合化、降幂的积分原则,并结合实例分析了这一原则在不定积分计算中的指导作用。