Abstract: Aiming at providing theoretical basis for nutrition diagnosis and scientific fertilization, combined lab analysis with mathematical statistics, we analyzed the relationships between soil and plant nutrients with tomato yield based on selecting samples from 367 solar greenhouses of 52 villages in Ju county of Rizhao City, Linzi distict of Zibo City, and Daiyue district of Tai'an City, Shandong Province.The results showed that among the three districts, the most commercial organic fertilizer was used in Rizhao, with the lowest EC (333 μS·cm^-1) but the highest tomato yield (117 930 kg·hm^-2).The most chemical fertilizer was used in Zibo, with the highest EC(730 μS·cm^-1) and the lowest tomato yield (80 745 kg·hm^-2).Generally, soil available nitrogen was insufficient, and soil available phosphorus and potassium was higher than that of average value in Shandong Province.The soil available microelements were relatively sufficient, but the distributions of some microelements such as Mn and Zn were fairly uneven among greenhouses.No correlation was significant between soil available nutrients, leaf nutrients and tomato yield.However, the correlation coefficients between SO₄^2-, PO₄^3-, NO₃^-, Cl^- and yields were all significant(R=-0.600, 0.792, 0.711, and -0.627.P<0.01.) respectively, which implied tomato yield was mostly influenced by EC value and anions in soil, and adding organic fertilizers may effectively relieve the soil salinization.The higher soil EC in Zibo caused excessive deposition of SO₄^2- and Cl^-, which restrained the absorption and transportation of other nutrients and finally decreased the tomato yield.Therefore, for nutrition diagnosis and fertilization prediction in higher fertility soils of greenhouses, both available nutrient contents and ion balance should be considered.