This study is to modify the collection of sea wave energy by using an inverted pendulum with vibrating base. As a result, the model itself is rich of nonlinear behaviours worth being investigated theoretically. The study shows that the coexistence of a pair of periodic doubling series leads to chaos respectively as the parameter varies. Furthermore, this coexisted chaotic motion can be merged into a large strange attractor. This provides a new route to chaos! The study also presents the significant founding that the system behaves a large periodic motion under the condition of large damping. This concludes that this model is of the best capacity of gathering energy with minor consuming and higher efficiency of kinetic energy output.