On the base of owning plenty of Chinese mountain torrents disaster investigation data, this paper first analyzed Chinese mountain torrents disaster actuality, causing-factors and spatial-temporal characteristic, then divided Chinese mountain torrents disaster prevention region into three types which named the first emphasis prevention region, the second emphasis prevention region and the generic prevention region. In the end, taking into accounting of existed natioral regionalization results and considering mountain torrents disaster sub areas characteristic, this paper studied the rule, method and basis of Chinese mountain torrents disaster and brought forward the regionalization system.