The system of allsilicon laser is designed, which is based on silicon wave guide of PIN structure.That system includes semiconductor pump photosource and the silicon waveguide amplifier. The model of input and output of the laser is set up, which is in great conformity with the results of the experiment. Combining with experiments and formula derivations, the waveforms of the pump beam and all-silicon laser beam are shown. The system can be integrated in CMOS device in order to achieve the integration of photoelectron equipment.