A Sewage Discharge Monitoring Terminal is designed with wireless module SIM300, ultra-low power single-chip C8051F930 and low-power memory AT45DB081B-RI produced by SIMCOM. The hardware and software circuitry and program code flow chart are provided. The problem that the staff have difficulty in site monitering due to the bad geographical conditions of sewage discharge monitoring points is resolved，and the efficiency of environmental monitoring is improved. The terminal turns off the GPRS module power and is in low-power mode in the absence of data transmission. Practice has proved that the terminal has low cost and is stable and reliable. Its low-power work prolongs battery's lifetime signifi- cantly and it is pratical.