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It is well known that convergence rate of finite element approximation is suboptimal in the
L 2norm for solving biharmonic equations whenP 2orQ 2element is used. The goal of this paper is to derive a weak Galerkin (WG)P 2element with theL 2optimal convergence rate by assuming the exact solution sufficiently smooth. In addition, our new WG finite element method can be applied to general mesh such as hybrid mesh, polygonal mesh or mesh with hanging node. The numerical experiments have been conducted on different meshes including hybrid meshes with mixed of pentagon and rectangle and mixed of hexagon and triangle.