Based on the five treatment fertilizer experiment data from 21 sites, we established the evaluation models for relative yield of summer peanut with the content of P, K in soil, and made the abundance and deficiency index of P and K in Nanyang basin. With the expert system of soil testing and fertilizer recommendations at county level, the formula dosage of P and K fertilizer was calculated, and verified, evaluated and demonstrated for application from²016 to 2018, so as to provide basis to establish and perfect the measuring soil fertilizer system.