This paper aimed at comprehensive utilization of rapeseed meal. The techniques of extraction and purification of rapeseed protein from double-low rapeseed meal deoiled by pressing at low temperature were investigated. Through pH value adjustment, orthogonal experiment, tests of extraction times and purification, preferable technical parameters on rapeseed protein extraction were achieved. The meal was extracted for 3 times, 20 min each time, at room temperature in an alkali solution with pH value 12 adjuste...