Abstract: To study the optimum technological conditions of ultrasonicassisted extractiny triterpenoid compounds from Cyclocarya paliurus leaves, on the basis of single factor experiments（ethanol concentration， ratio of solvent to material， extraction time， extraction temperature, extraction times, ultrasonic power, extraction solvent）， the experiment was designed with L9（34）. The results indicated that 70 ％ ethanol solution， 1〖DK〗∶40 between material and extraction solution， 400 W ultrasonic power and 45 minutes for extraction were optimum conditions. With the optimized technology， the average yield is 222 ％. The technology is relatively stable，so it is suitable for extraction triterpenoid compounds from Cyclocarya paliurus leaves.