A highpower allfiber supercontinuum（SC） source is demonstrated by splicing a picosecond fiber laser with a homemade photonic crystal fiber（PCF）. The allfiber configuration enhanced the stability and conversion efficiency of the system. The supercontinuum excitated by picosecond pulses in the normal dispersive regime is studied. The supercontinuum broadening process is explained theoretically. The ultimate supercontinuum spans over 1000 nm with an average power up to 4.6 W and a conversion lightlight transfer efficiency of 54%.