Objective:To optimize extraction process of alkaloid from Phyllanthus urinaria Linn. Methods:To optimize the extraction process by using single-factor test and orthogonal test L9(34).,Results:Factors affecting the yield of total alkaloids were temperature of water bath(C) >acid pH(B)>extraction time of ultrasonic(A) >time of water bath(D). The optimal extraction condition was A1B1C3D2,which were extract time of ultrasonic for 20 min with acid pH of 3,water bath treatment time of 1.5 h and temperature of 70 ℃. The yield of total alkaloid...