Abstract: In order to get the most stable mistuned blade system, a new design procedure has been presented in this paper. The damping factor of the most unstable mode shape of mistuned blade system is chosen as the cost function of optimization. The results of computation show that the mistu-ning pattern with which the system is the most stable one will vary as the aerodynamic condition changes, but all these optimum mistuning patterns have the same characteristic that the amounts of mistuning between neighbour blades are large. The results also show that the mistuning pattern which is being used in engine that are enlisted for the airforce has a good effect for controlling flutter.