We design parameters of multiple mass-spring system, such as masses and spring constants, under Grover algorithm in an experimental simulator to concentrate wave power. Since waves were vertically oscillated at offshore, multiple floats with springs as small oscillators are intended to be used for wave power accumulators. These oscillatory energies of the floats were concentrated into a special small oscillator through a plate with spring as a large oscillator in Grover algorithm. Accumulated wave power in the special oscillator is transferred into electricity though connected power generator as damper in the multiple oscillators. To achieve this mechanism, natural frequency of the small special oscillator is designed to be close to either of the two eigen-frequencies of the multiple oscillators. Parameters of the system were designed for the experimental simulator with water tanks on desk for demonstration by using numerical simulations.