The precursor powder of AgCl prepared by solid state reaction milling and different dry processes were mixed with Ag nanopowder in a certain ratio, prilled, pressed into a mold and then sintered, and finally a composite Ag/AgCl porous electrode was obtained. The electrode was characterized by SEM, XRD, electrochemical workstation and electrical noise test set. The influence of the porous structure of the electrode was discussed on the polarization properties, short-term stability and electrochemical noise. Results show that the precursor powder of AgCl prepared by freeze-drying method has excellent dispersivity and uniform size. The prepared composite Ag/AgCl electrode presents a porous structure with large exchange current density and good consistency. The potential difference of the two like electrodes is about –0.2744 mV. The electrode possesses good short term stability, with a potential difference drift less than 0.0477 mV/24 h. The voltage noise density of electrode is down to nV/Hz1/2 level at 1 Hz