A sensitive, fast and low-cost molecular imprinted polymeric sensor for quantitative determination of pa-rathion was prepared with chitosan(CS) as function matrix and parathion(PT) as template molecule via constant po-tential electrochemical deposition. Sensitive response was obtained with a detection limit of 1.0×10-7mol/L and an excellent recognition for PT was achieved due to the good memory capacity of the sensor. The developed sensor ex-hibited good fabrication reproducibility and acceptable stability, which provided a new promising tool for pesticide analysis.