Objective To study the alkaloid compounds in the roots of Cocculus orbiculatus var.mollis.Methods The compounds were isolated by silica gel chromatography,and their structures were established by spectroscopic methods.Results A novel cocsolines-type bisbenzylisoquinoline alkaloid named orbiculatinine (1),along with three known compounds (+) 1,2-dehydroapateline (2),trilobine (3),and isotrilobine (4),were isolated.Conclusion Compound 1 is a new compound named orbiculatinine.Compounds 2-4 are isolated from this plant for the first time.