Based on analysis on the factors influencing blastability of rock,the hardness coefficient and acoustic impedance of rock,explosive specific charge and mean fissure distance were chosen as the evaluation index of blastability classification of rock,a comprehensive projection pursuit evaluation model for blastability classification of rock was established,its project direction was optimized by Genetic algorithm,and the obtained relationship between the blastability evaluation grade of rock and projection value is y=0.2704z3-1.310z2+2.708z+1.0137.The evaluation model was applied to class the blastability of rock in a underground mine,the evaluation results showed that the evaluation model can avoid the influence of subjective factors on the weight of evaluation index,the evaluation result of the model is accurate and objective.It provides a new method to the blastability evaluation of rock.