Geomorphic features of a gully is an important slowly varying factor in the processes of debris flow,which determine the driving forces of debris flow,restrict the surface runoff converge among water source conditions and influence the ways of solid material supply.Therefore,debris flow occurrence can be analyzed by the geomorphic features of a drainage basin.By taking a rainstorm-induced debris flow gullies in the middle of Zagunao Riverbasin as the research object,the relationships among geomorphic information entropy in gully developmentstages,basin area,longitudinal channel bed gradient and debris flow disaster characteristics are analyzed.Geomorphic information entropy of the high frequency debris flow gullies is found to be 0.12～0.20and thelow frequency debris flow gullyondaryURI ,0～0.12and 0.20～0.30,respectively.When gully area is>15km2 andlongitudinal channel bed gradient is<300‰，debris flow is watery,and on the contrary,is viscous.