According to the heavy metal investigation of some practical data in Changchun sewage treatment plant. For wastewater treatment plant and the commonly used treatment process wastewater process of the distribution of heavy metals are analyzed. We studied the heavy metals pollutant removal efficiency of situation with A/O process of wastewater treatment plant in frozen period. And make a comparative analysis of heavy metals pilot plant and demonstration project in water, determine target pollutants and focus on removal. Thus, under low temperature conditions so as to sewage treatment plants effectively remove heavy metal pollutants to provide theoretical guidance for the control of urban sewage treatment by-product of the deposition process to improve the quality of urban sewage treatment and provide scientific basis.