The flow-induced acoustics of a fish school or collective fish swimming interests scholars in both fish behavior and bio-mimetics for underwater vehicles. Simulation of the sound field generated by the flow of a typical model of fish swarm are performed. The generation and propagation of the hydrodynamic sound are studied, in order to investigate the sound field and radiation property. By analyzing the sound field and the vortex evolution, the control and optimization of the kinematic parameters are proposed to minimize the flow generated sound with no extra energy needed, which might match the expectation of relevant engineer or fishery societies. The DNS-APE method has been proposed in previous works to study the sound generated by the two-tandem-foil system, with key kinematic parameters varied, including the distance, the phase difference, and the respective undulating form of the two foils, simulating the typical motions in fish schooling. For the case of two undulatory foil with the same wave form and different phases, the optimized phase difference is 180 degree. More results of fish swarm, consisting of 4 undulatory foils are shown, and the flow and noise control mechanisms are revealed in this talk. The results provide shed lights on the related bio-acoustics and might inspire the bio-mimetic developers in the future practical scenarios.