Abstract: With the continuous reduction of resources，the development and utilization of difficult-to-use resources is more and more important.In the background of safety pillar blasting stope at Western District in Chengchao Iron Mine，considering the high strain rate which will cause the dynamic hardening of the material during the blast and the impact of the rock mass from the blast，the user-defined dynamic damage constitutive model was built and inserted in LS-DYNA by secondary development.Its correctness had been verified through comparison with the blast stoping example of Western District in Chengchao; Finally，the further research was carried out on the basis of the improved damage constitutive model，the applicable stoping method and stoping sequence was obtained.The damage characteristic of the rock mass in the stope was investigated，which offered guidance for the actual construction.

Key words: High strain rate, Improved damage constitutive model, Blasting stope, Damage characteristic