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In consideration of adiabatic dust charge variation, the combined effect of the exteal magnetized field and the dust temperature on head-on collision of the three-dimensional dust acoustic solitary waves is investigated. By using the extended Poincaré-Lighthill-Kuo method, the phase shifts and the trajectories of two solitons after the collision are obtained. The effects of the magnitude and the obliqueness of the exteal magnetic field and the dust temperature on the solitary wave collisions are discussed in detail.