Abstract: In order to explore the substrate cultivation techniques of Brassica rapa,carried out a study in Tramy smart vegetable fac‐tory,this study evaluate the effects of different plug sizes and planting densities on the growth,quality and yield of Brassica rapa,se the three plug sizes （72,128,200 holes） in this study,fresh weight of aerial part of the Brassica rapa was seeded in 3 different plug sizes was 3.6 g,2.3 g and 1.27 g respectively.The results showed that with the reduction of the number of holes in the plug plate,the Brassica rapa grewd better,but the yield of the Brassica rapa that was seeded in the three different plug sizes was 515.8 kg/667 m~2663.5 kg/667 m~2and 562.4 kg/667 m~2respectively.Therefore,comprehensive considering the cost of production and yield,the 128hole plug plate was the most suitable plug size for seeding Brassica rapa.