As one of the hotspot,supercontinuum is researched in optical communication field nowadays.This paper mainly investigates supercontinuum generation in biconical double fiber by using Ti-sapphire laser with ultrashort pulses.Biconical double fiber is made of two single mode optical fibers drawn from the axial in a certain way.The results show that the supercontinuum broaden increases with the increasing of input power and tapered length.Diameters of the tapered fiber have a great influence on supercontinuum broadening.Compared with the ordinary optical fiber,biconical double fiber can generate wider and more flat supercontinuum at same incident power.