The invention relates to the field of electric power systems, in particular to a method for control over power grid time-space characteristics through coordination of alternating currents and direct currents. According to the method, time and space characteristics of a power grid are taken into consideration, direct current modulator parameters are optimized by means of a particle swarm algorithm according to the disturbance amplitude of a power grid monitoring data recognition system, direct current transmitting power is adjusted in an self-adaptive mode, therefore, coordination control over a multi-loop alternating and direct current system is realized, and the level of transient stability is improved. The method for control over the power grid time-space characteristics through the coordination of the alternating currents and the direct currents reasonably utilizes resources in the power grid, is an effective way of improving the safety and economic benefit of the power grid, and has great significance in guaranteeing the economic efficiency, the safety and the reliability of normal operation of the power grid.