Phosphorus Copper Filler is made by adding Phosphorus to Copper to lower the melting point and to give self-fluxing effect to Copper matrix. By adding Ag and Sn to Copper-Phosphorus dual alloy, it may be achieved to improve workability and diffusion, to lower the melting point and to improve fluidity. This Phosphorus Copper filler has high mechanical strength and good effect of anti- corrosion to be widely used for Copper and Copper alloy for ships and heat exchangers.