The ε-HNIW was coated by several kinds of materials such as fluororubber and chemigum by means of extruding-prilling,solution suspension and water suspension methods. The coated HNIW samples were evaluated by means of SEM and impact sensitivity test in order to confirm the desensitization effect and the effectiveness of the coating methods mentioned above. Results show that the solution suspension method is better than the extruding-prilling method to desensitization of HNIW. Among coated samples,impact sensitivity of ε-HNIW coated by fluororubber F-5 by water suspension method is the lowest,value of characteristic height(H₅₀) is 42.5 cm.