Abstract: This paper mainly discusses the mixed broadleaved forest in gullies and deep valley of southern Taihang Mountain region. The following conclusions can be drawn:(1)It is a stable,species-rich,structure-complicated vegetation type without an evident dominant.(2)This vegetation type can be divided into two kinds:the one in lower altitude and the one in higher altitude. There are a large number of subtropical species in the former one,especially in tree layer,which can not be seen in zonal forest types.(3)The warmer and moister habitat in gullies and deep valleys is the main reason that species assemble there.(4)The mixed broadleaved forest in lower altitude is a kind of "heterogeneous remnant community".The aim of this paper is to provide theoretical reference for further studies of this unique community type and to provide scientific basis for the study of environmental change and nature conservation of this area.