The invention discloses a direct-current receiving end power grid harmonic distribution and resonance control method based on a modal analysis method; the direct-current receiving end power grid harmonic distribution and resonance control method comprises the following steps that the modal first-order sensitivity and second-order sensitivity of each element parameter in a direct-current receivingend power grid are calculated; and before the change of the element parameter reaches a critical value, the capability of inhibiting the resonance is adjusted by comparing the parameter of each element with the first-order sensitivity, and after the change of the element parameter exceeds the critical value, the parameters of the elements are compared through second-order sensitivity to obtain anelement parameter adjusting mode with the optimal resonance suppression effect, and the resonance of the direct-current receiving end power grid is controlled through the adjusting mode. According tothe method disclosed by the invention, the modal first-order sensitivity and second-order sensitivity are combined, so that the resonance inhibition effect of the parameters of each element can be more accurately compared and adjusted; and the instability of the traditional modal sensitivity is overcome.