Abstract: To evaluate the damage ability of conventional warhead to tunnel targets, based on an analysis of damage characterization connotation of tunnel targets, the damage characterization parameters system of tunnel targets under conventional weapon attack was proposed,including defense layer damage parameter,protective door damage parameter and inner space damage parameter. The quantization measurement of those damage parameter was presented.Based on fuzzy synthesize assessment measurement and analytic hierarchy process,the damage assessment model of tunnel targes was put forward to implement the multi-parameter damage assessment for tunnel targets effectively and to evaluate quantificationally the synthesize damage effectiveness of warhead to a given target.It's indicated that the damage assessment model has a strong practicability.