Objective:Using the method of Semi-bionic Extraction to extract the trace element in psoraleae fructus,we studied the influence of Semi-bionic Extraction to the extraction of trace element.Method: using the dissolution rate of Cu、Zn、Mn、Fe as a index,to investigate the influence of pH value in three decoction and the decoction time to the extraction of Cu、Zn、Mn、Fe.Result:the pH value in the first decoction is more effective to dissolution of Cu、Zn、Mn;and the pH value in the third decoction is more effective ...