It was illustrated that the mining conditions inducing disasters changed with depthboth in regularity of gradual and sudden change. The sudden change depth for differentdisaster conditions are different and controlled by different factors. The high temperatureand its change with depth are mainly controlled by strata structures and rock heat conductiv-ity property, the high rock stress and dynamical engineering disasters and their change withdepth are mainly controlled by tectonic conditions, roof strata rock property and deep rockmechanical property, coal mine water disasters and their change with depth are mainly con-trolled by rock mechanical property of coal seam floor and regional groundwater circulationconditions, gas disaster conditions and their change with depth are mainly controlled byburied conditions of coal seam and opening conditions of geological structures. It is men-tioned that the key point for the control of deep coal mining disaster is to clearly understandthe sudden change depth of different factors causing disasters.