Abstract: Based on underground sound early warning principle,and then deviation value of terrestrial sound activity DEV was selected as underground sound early warning index,warning principle was constituted according timeliness and practicability of early warning,the idea that combination optimization early warning model with different sliding step n and warning thresholds DEV₀ was put forward.Underground sound precision and false alarm rate,and DEV₀ two parameters were analyzed by multiple factors and unrepeated trials variance analysis,the parameters n and DEV₀ play an important role on warning results,the DEV₀ was the main influence factors.According effectiveness weighing double aims function,the optimal solution combination of early warning was derived as sliding steps was 8 and warning thresholds was 70%,the corresponding underground sound precision was 67%,missing rate was 33% and false rate was 29%.