Taking tomato variety‘ Fengshou’ as experimental material，this paper studied the effect of zinc and potassium fertilizers on the growth，photosynthetic characteristics，yield and quality of tomato under a closed cycling soilless cultivation system. The results showed that enriching application of zinc and potassium fertilizers could increase the plant height，stem diameter，leaf number，improve net photosynthetic rate，transpiration rate，etc. photosynthetic indexes. The contents of VC，soluble sugar，soluble solid，titratable acid，and sugaracid ratio were all increased. The single fruit quality and yield per plant were also significantly improved. The effect of potassium fertilizer on tomato growth，yield and quality was higher than that of zinc fertilizer，and the effect of joint application of zinc and potassium fertilizers was better than that of single application.