Ammonium nitrate is modified by adding anti-explosion agent to reduce its impact sensitivity. According to thermal decomposition of AN and hot-spot theory, six chemical materials such as ZnO,(NH2)2CO,Na2HPO4,camphor, Mg2(OH)2CO3,Na2CO3,NH4NO3 were selected as components of anti-explosion agents. Modified AN were prepared by adding these chemical materials to formulate industrial explosives. The impact sensitivity of these explosives at drop height of 65 cm with 10 kg drop hammer was tested. Results show that comparing with the pure explosion in which has no additive, when 5% anti-explosion agent ZnO/Na2HPO4/Mg2(OH)2CO3=33/34/33 are added in system, the impact sensitivity can be decreased from 88% to 24% and the impact sensitivity also declines with the decrease of hardness and stacked density of modified AN. The same result can be obtained by slow crystallization method.