Runners of hydroelectric power generation system are subjected to various excitation mechanisms. The natural frequencies and mode shapes are important parameters which determines the behavior and response of the runner to different excitations. One of the important aspects of dynamic response of runner is the effect of water known as added mass effect. Added mass effect lowers the natural frequency of a system while submerged in water as compared to in air. This paper presents the mode shapes of a propeller type runner blade determined experimentally and through Finite Element Analaysis (FEA). Good agreement was found between the experimental and FEA results. FEA analysis was further extended to include the added mass effect and determine the natural frequencies and mode shaped in water. The results are compared and discussed.