[Objective]Different extraction conditions which influenced extraction percentage of Northeast Rape leaves was studied to ascertain the best extraction technics of protein in Northeast Rape leaves.[Method] Northeast Rape leaves(dry) as subject,using the Kjeldahl Nitrogen Determination method,Soxhlet extraction method and direct drying method,the content of leaf protein,crude fat and water in Northeast Rape leaves were determined to study the influence of different pH,extraction temperature,time and the rati...