Dynamic economic emission dispatch of power system plays an important role in energy saving and e- mission reduction. In this study, the model is established by taking economic cost and environmental cost mini- mum as the optimization objectives. The energy cost caused by the valve point effect of the conventional thermal power unit is included in the economic cost. The network loss is considered in the equality constraint, and the solution equation is used to deal with the complex constraint relation in this model. In view of the premature di- versity caused by the low diversity of differential evolution algorithm, the modified differential evolution algo- rithm is adopted to solve the model. Under the premise of ensuring the accuracy of the original calculation, the ability of Matlab parallel computing is used to enhance the differential evolution algorithm and improve the com- putational efficiency of the algorithm. The simulative results of the classical 10-unit test system show that com- pared with the traditional differential evolution algorithm, the parallel modified differential evolution algorithm not only has better global search ability, but also can provide a faster and better choice for decision-makers.