Abstract: Confecting nutrient to regulate the nitrate accumulation content of pakchoi, this could provide some theoretical evidence to reduce the nitrate content of pakchoi. By adopting the 416-B optimum compound design and SAS analysis, the mathematics model of different resource of nitrogen (NO-3-N,NH+4-N) phosphorous (P) and potassium (K) on the nitrate content of pakchoi was to be founded in this study. Results suggested that nitrogen was the main cause of the nitrate content of pakchoi, between NO-3-N in nutrient and the nitrate content of pakchoi was positive correlative, but nitrate content would decrease with elevated NH+4-N concentrations in an appropriate concentration range. The nitrate content would decrease with elevated phosphorous and potassium at a certain concentrations. The relationship among nitrogen (NO-3-N, NH+4-N) phosphorous (P) and potassium (K) could also be an important factor. The nitrate content of pakchoi could be regulated and decreased by confecting nutrient.