Abstract: Executive mechanism of trenchless drainage machines was designed，which were applied to ecological control project of Saline alkali land in Hetao Plain.Combining with problems that may be faced in actual operation process，through dynamic analysis based on RecurDyn and static analysis based on ANSYS，dynamic characteristics，vibration characteristics and static characteristics of executive device were obtained.Rationality and feasibility of design structure were proved by comparing intensity of design structure and simulation analysis.Through modal analysis，it provides theoretical analysis foundation for subsequent vibration and impact performance test of mechanical parts in field operation.It provides some references for improving machine performance and reducing machine test cost.