OBJECTIVE： To study the chemical compositions of the leaves of Iris tectorum. METHODS： Using 70％ ethanol for extracting， silica gel column chromatography， Sephadex LH-20 chromatography and thin-layer chromatography were used to isolate and purify the chemical compositions of the leaves of I. tectorum， the compound structures were analyzed and identified according to the physicochemical properties and spectral data. RESULTS： 12 compounds were isolated from the leaves of I. tectorum， namely 5，7，4′-trihydroxy -6-methoxy isoflavone （1）， tiliamin-7-O-β-D-glucopyranoside （2）， 5-hydroxy- 4′ ，7- dimethoxy-isoflavone （3）， tectoridin （4）， tectorigenin （5）， iridin （6）， dimethyl tectorigenin （7）， genistein （8）， protocatechuic acid （9）， isorhamnetin -7-O-β-D- glucoside （10）， daucosterol （11）， tetradecanoic acid （12）. CONCLUSIONS： Compounds 1， 2， 3 are isolated from the plants of the genus for the first time， and the study has laid the foundation for the quality evaluation of I. tectorum.