Abstract: A new brazing alloy of Cu-Mn-Zn-Si for the brazing of steels and hard alloys is developed.This paper explains the selection of the brazing alloy systems and the optimumpro portioning of various components.Results show that the strength of the brazed joint with this alloy is much higher than that with brass brazing alloy.This new alloy has a very high impact-resistant strength and also a good cold-rolling property.Due to its low melting point,the brazing temperature and hence the energy consumption,can be lowered.As a result,the residual stress and deformation will be reduced.The new alloy has a fine grain structure,which will improve the quality of brazing.This new brazing alloy causes less serious environmen pollution owing to its low zinc content in addition to low melting point.