In cucumber seedling stage, nitrogen, phosphorus and potassium (20~20~20) water-soluble fertilizer and humic acid active liquid fertilizer or amino acid active liquid fertilizer were applied to promote root rooting and seedling growth. During the flowering and fruiting period, nitrogen, phosphorus and potassium (20~20~20) water-soluble fertilizer plus potassium sulfate or potassium nitrate plus potassium dihydrogen phosphate is applied to promote flowers and protect melons.