A new method of directly charging active metal nano-particles was developed so as to be used to improve the efficiency of depositing precious metals in catalytic layer. The precursors of active material were impregnated in porous carbon black layer in advance, and Pt or Pt alloy were firstly deposited on the surfaces of carbon black nearby Nafion particles by the pulse electro-deposition method. The performances of the electrodes were characterized by CV, and the structure and composition of deposited nano-particles by XRD, TEM and EDS. The optimum condition of the preparing process is toff /ton=300:100, wPtRu/wC=40% (mass fraction), nPt:nRu=1:1 (atom ratio). The specific surface is 92 m2/g, particle size 3.2 nm. Methanol peak value of current density reaches 82 mA·cm-2. The efficiency of Pt-M in porous catalytic layers is much higher than that of thin film electrode method, reaching about 79.1%.