The effects of irrigation and fertilization regulation on the growth and nutrient accumulation of Orychophragmus violaceus(L.)Schulz and succeeding peanut as well as on soil fertilirty were studied. The results showed that both irrigation and fertilization significantly promoted the growth of Orychophragmus violaceus. In green manure season, irrigation significantly increased the biomass, N, P and K contents of Orychophragmus violaceus with or without fertilization. Compared with the treatments without irrigation, NPW treatment (green manure growing season with N, P fertilizer and irrigation) and CKW treatment (green manure growing season with irrigation but without fertilization) increased the biomass, root activity, and contents of N, P and K of Orychophragmus violaceus by 66.47% and 63.97%, 76.95% and 32.36%, 88.31% and 9.80%, 21.71% and 15.56%, respectively. The nutrients returned to field from the turned down Orychophragmus violaceus was 91.04–260.23 kg/hm², accounting for 27.59% – 78.86% of the total nutrients of the applied chemical fertilizers in peanut season. Compared with CF treatment (winter idle), the treatments of green manure growing with fertilization and irrigation promoted the yield and nutrient accumulation of succeeding peanuts, and also increased soil nutrients, among which the effect of EN treatment (same annual nitrogen nutrient condition,main crop nitrogen reduction fertilizer) was most obvious. Under same annual nutrient condition, 35.00% of nitrogen and/or 42.86% of phosphorus fertilization in peanut season transferred forward to the green manure season significantly increased the nutrients returned to field from the turned down green manure and increased peanut yield by 22.82% – 41.18%. In summary, appropriate irrigation and fertilization can significantly increase the biomass of Orychophragmus violaceus, thus can increase the yield and nutrient accumulation of succeeding peanut. The above results can provide data support for the application of green manure and fertilizer reduction in China.