This paper compares and studies the strahler integral value S

theinformation entropy valuq H and the shape index N of river gully longi-tudinal section in rectangle basin

considers N as the index of therectanglebasin geomorphy developing stage. At the same time

this paper utilizesthe information of the three rivers (Jinsha River

Lancangjiang Riverand Lujiang River) basin in the northwest of Yunnan

demonstrates theindexes above all

at last draws the information of the developing stagein the cause of eroding circle and the information of the stability inerosional basin.