This invention discloses an optimizing method for the attached mass position of a curve vibration thin plate loudspeaker including: setting up a curve vibration thin plate model based on a PDE moduleof a FEMLAB software to define its parameter and its border conditions, then carrying out network division to the plate and mode analysis and that of the steady-state to get the mode distribution whenthe plate is not attached by the mass and the normal velocity of its surface vibration, then combining the inherit optimization algorithm to optimize the mode distribution so as to get the optimum position of different attached masses under rather smooth mode distribution and fixing the attached mass on a related optimum position of the plate to get a better sound pressure frequency response curve and finally getting related sound pressure frequency response curve based on the computation of Rayleigh integral formula.