It aims at improving the uniformity of the energy beam to irradiate efficiently. The fusion irradiation configuration determination method of the present invention is a method for calculating an irradiation configuration when irradiating an energy beam to a fusion target, and the irradiation configuration on the spherical surface S0 set using random numbers. An initial placement step S202 for virtually placing the charge Qi on the initial coordinates of several NB, and the coordinate ri of the charge Qi are constrained on the spherical surface S0 in time series based on the Coulomb force acting between the charges Qi. The coordinate analysis step S203 to be analyzed, the potential evaluation steps S205 and S206 for determining the time when the potential energy of the charge Qi is stabilized based on the coordinate ri, and the coordinate ri at the time when the potential energy is stabilized An irradiation configuration deriving step S207 for deriving as an irradiation configuration of energy rays when a fusion target is arranged at the center; Obtain.
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