Abstract: In this study,pharmacognositical methods were employed to establish the quality standard of Eucommia Fructus of Shaanxi.The morphological and histological characters of Eucommia Fructus were described.The rate of seeds,moisture content,ash content,degree of rancidity and total fat content of samples from different production places of Shaanxi province were determined.The principal bioactive constituent(aucubin) was analyzed by TLC(qualitatively) and HPLC(quantitatively).Based on the data of each assay,the quality standard of Eucommia Fructus from Shaanxi was tentatively set up.The quality standard established in this paper was objective and reasonable.The developed evaluation method was of good specificity.It can be used for quality control of Eucommia Fructus of Shaanxi.

Key words: Eucommia Fructus, quality standard, HPLC, aucubin