Errors in balanced nutrition according to yield objectives put forward by Stanford in the US were analyzed in the paper.Problems in calculating fertilizer dosage according to relative nutrients content in soil were pointed out and relative fertilizer model was constructed.Interior relationship between soil testing value and recommend fertilizer dosage was explained theoretically.In this model,soil nutrients utilizing index and fertilizer utilizing index were avoided,and three stable indexes were adopted,i.e.,Fp,Tp and D.