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The problems existing in the deter^nination of early warning index of mountain torrent disasters in small watershed without data, this paper presented infor^nation based on flash flood disaster and flood investigation, introduced the concept of frequency range and deviation, comparison of eigenvalue and critical rainfall of flooded rainfall, preliminary inspection of early "warning indicators; aiming at the main factors that cause the error of early warning index, through the analysis of water flow relationship between rationality of the slope, roughness, runoff and confluence calculation method and parameters, indirectly review- of early warning indicators. This paper studied Hexigou small watershed in Hexi Village, Xujiagou Town of Anyang County. The results show that Hexi Village under 0.8Wm 1 h critical rainfall is more reasonable, but 2h smaller by 31.2% ； review finds out that the relationship between water flow and runoff in Hexi Village exists error, leading to 2 h early warning indicators much smaller. After review 0.8Wm 1 h and 2 h critical rainfall deviation is within the allowable range and w-am-ing accuracy improved significantly, showing this method is feasible for the detection of critical rainfall in mountain torrents. [ABSTRACT FROM AUTHOR]