Abstract: To improve the performance of the multi-channel electro-hydraulic servo loading system, a multi-objective robust control method based on LMI(linear matrix inequalities) was proposed. Several factors such as parameter uncertainties, strong couplings among different loading channels, and performance differences caused by application of asymmetric hydraulic actuators for the loading system were all considered as a general uncertainty. The design process was composed of associating control system frequency band with performance weighting functions, associating system uncertainty with robust stability weighting functions and associating transient response behaviors with regional pole placement. By means of establishing and solving a LMI based convex optimization methodology, this multi-objective control problem can be solved subsequently. Simulation results show that the proposed control law design approach can achieve high dynamic performance and robust performance when the parameters of the electro-hydraulic servo loading system are changed in a wide range.