Abstract: Based on the principles and methods of the quality control chart, its application in early warning system of growth regulator residue was detected over the chlormequat chloride and gibberellins residue data of Chinese flowering cabbage and edible amaranth in Guangzhou.The early-warning models for chlormequat chloride residue in Chinese cabbage and gibberellins residue in amaranth were set up, which was respectively based on the “residue detection rate”control chart and the “average residue value-standard deviation”control chart.The two models were proved to be valid for early warning system when applied to assumed monitoring data.