Using substituted phenol as starting compound, through nucleophilic replace prepared substituted phenoxyacetate, then with silicone load stannic chloride, dimethylbenzene, 2-(Diethylamino)ethanol, six new (diethylamino)ethyl phenoxyacetate derivaties were synthesized. The title compounds were fully characterized by means of IR,1H NMR,13C NMR and MS. The preliminary results indicate that all these compounds can improve the nitrate reductase activity of the corn seedlings, under the concentration of 20 mg/L of the nitrate reductase activity of 2-bro-(diethylamino)ethyl phenoxyacetate was the highest.