Method of field survey for debris flow is classified into two types:regional survey and gully investigation.Two methods are systematically discussed.Regional survey is main to collect and analyze the background material of the formation and active area of debris flow,then to disting uish the debris flow gullies.The gully investigation is main on the landforms,geologic structure,weather and hydrology,etc.of some specific debris flow gully,there form to determine the different indices needed by the control engineering design of debris flow.