Abstract: The potted test was conducted to study the effects of Stanley water-soluble fertilizers 20-20-20 added with several trace elements on yield and quality of Chinese cabbage. Results showed that, the morphological indexes and the quality indexes of Chinese cabbage under the treatment of Stanley water-soluble fertilizers were superior to that under the treatment of ordinary water-soluble fertilizers and ordinary sulfur compound fertilizers. The Chinese cabbage leaf color of Stanley water-soluble fertilizers treatment was thick, stem was stout during its whole growth period, and its root length, plant height, leaf number, leaf width were significantly higher compared with the control treatments. The difference among several treatments was obvious. Compared with ordinary water-soluble fertilizers and ordinary sulfur compound fertilizers, the vitamin C content of Chinese cabbage under Stanley water-soluble fertilizers 20-20-20 treatment increased 8.8% and 15.1%, soluble sugar increased 9.4% and 11.8%, and soluble protein increased 9.2% and 10%, respectively. The difference between the two groups was statistically significant. The nitrate content reduced 7.9% and 10% respectively compared with the control treatments, and the yield increased 8.8% and 13.1% respectively, with remarkable yield increasing effect. Research results showed that the application of Stanley water-soluble fertilizers 20-20-20 added with several trace elements obviously promoted the growth and development of Chinese cabbage, improved the content of vitamin C, soluble sugar, soluble protein, and reduced the nitrate content, therefore, significantly improved the quality and yield of Chinese cabbage.