Abstract: The formation of lead oxide,mono-oxide and dioxide,on Pb-Bi alloys in sulfuric solution was studied by means of linear sweeping voltammetry(LSV),scan electron spectroscopy(SEM),AC voltammetry and inductively coupled plasma atomic emission spectrum(ICP).The results obtained by LSV after applying a potential at 0.9 V for 20 min show that bismuth content lower than 0.103% in the alloys does not affect the formation of mono-oxide,but it will accelerate the formation of the mono-oxide when its content in the alloys is higher.Z' versus E curves indicate that the conductance increases with bismuth content increasing;similar behavior for the effect of bismuth on the formation of dioxide as that of mono-oxide can be found from the results obtained by LSV after applying a potential at 1.6 V for 20 min.It is shown by SEM that the oxides have more pores on the alloys with high bismuth content.It is found from ICP analysis that the stripping amount of bismuth in the alloys increases with bismuth content increasing.