Orychophragmus violaceus can be used as winter green manure in North China，forming a good foodmanure cropping system with spring maize.This experiment investigated nutrient contents and accumulations of Orychophragmus violaceus from returning green to maturity.Results showed that the nutrient contents of Orychophragmus violaceus were high.At full flowering stage，the contents of N，P and K were 296%，042%and 275%respectively.The accumulation amounts of N and K were large，but P was small.The plant had accumulated 863%~940%of total nutrient accumulations by full flowering stage，which was the most suitable incorporation time.The change of nutrient accumulation could be described by Logistic equation y=k/(1+aebx)，showing that the appearance time of highest P absorption rate was earlier than that of N，while that of K was the latest.