Abstract: This paper introduces the method of recognition of sedimentary mélange and puts forward the technical line in the regional survey of a sedimentary mélange terrain in an orogenic belt. It is suggested that a three order system of mapping units of sedimentary mélange be adopted: the first order is the sedimentary mélange zone, the second order is the sedimentary mélange layer, and the sedimentary order is the sedimentary mélange body. Take the Zhongdian area for example, the method of representation of these mapping units on geological maps is demonstrated.