In order to reduce the repair and test time for the hydraulic system of intelligent drilling tool and to improve the quality ol technical services, a test bench which could simulate the hydraulic system ol the intelligent drilling tool was developed. The test bench was designed based on the operating principle of the hydraulic system lor the intelligent drilling tool and uses the measuring and control circuit in BH series intelligent drilling tool as its own measuring and control circuit. By simulating the working process of the hydraulic system, the test bench makes lunctional experiment and troubleshooting of each hydraulic part. The result showed that the test bench could test each part in the hydraulic system separately and the result ol experiment could accurately indicate its working perlormance and lault reason. Therefore, the conclusion obtained is of important signilicance to improvement of tool assembly and test efliciency.