By using the removal rate of Cd2+ as the index, a research has been carried out of a mixture of sulfate-reducing bacteria (SRB), cultured and domesticated from sewage sludge, on the removal effect of low concentration cadmium-containing waste water under anaerobic growth environment (pH=7.5, temperature 35℃). The results show that the removal efficiency of SRB as the dominant strain decreases with the increase of Cd2+ concentration. With the initial mass concentration of Cd2+ less than 40 mg/L, the removal rate of Cd2+ approximates 100%，a stable treatment effect so far achieved. When the initial mass concentration of Cd2+ reaches 60 mg/L, Cd2+ exerts a toxic effect on the strain, with SRB losing its processing power. The results show that SRB can effectively remove low concentration cadmium ions in wastewater.