The signals of the free radicals in explosives under shock were arrested by using EPR. Based on the spectral line of the free radicals, the ability of the getter in arresting the free radicals was investigated by EPR. The low volnerability of the explosives was estimated and the idea of designing LOVA explosives by the guide of the insensibility mechanism based on the free radical theory was proposed.%以顺磁共振为手段获得了冲击下RDX炸药的自由基信号，并以获得的自由基谱线为依据，用顺磁共振等分析仪器测定吸气剂(getter)捕获自由基的能力，评价炸药的低易损性。提出了以自由基理论为基础的钝感机理来指导设计低易损炸药的思想。
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