This study presents the vertical structural performance of wood-concrete composite beam. This composite beam has a superior performance of fire protecting and sound-proofing. In addition this composite beam is superior to a simple beam in strength, stiffness. But there is not the design method and there are few study accumulations of wood-concrete composite beam system with shear connecter in Japan.<br>In this paper, the result of shear performance of shear connecter between timber beam and reinforced concrete slab is described. The result of bending test is also described and traced by numerical model. They are summarized in 1) the composite beam increases more than 180% in strength and 280% in stiffness to simple timber beam, 2) numerical model traced to the result of bending test accurately.