Abstract: The biotic and chemical agents were used respectively to induce the systemic resistance in muskmelon (Cucumis melo L ) in fields of Hami in Xinjiang province in 1996 and 1997 The induced resistance in the melon successfully prevented from Phytophthora melonis infection in nature for four weeks In contrary, plants in CK suffered a lot compared to the treated plants There were no differences between treated and CK plants in respect of growth and fruit-bearing