Abstract: A large number of renewable energy are connected to the electricity-gas distribution network（EGDN） and the pressure changes of the pipeline network during gas transportation may increase the voltage fluctuation of the distribution network. In this paper, a distributed active-reactive power coordinated optimization control method for EGDN considering asynchronous communication is proposed. Firstly, the active-reactive power characteristics of each component in the EGDN are studied.Secondly, according to the characteristics of reactive power demand in the process of EGDN energy transportation, the supply and demand model of reactive power in the EGDN is established. Then, considering the EGDN reactive power balance and network operation constraints, the reactive power and voltage optimization control model for EGDN is established to minimize the power grid voltage fluctuation, network loss and electricity/gas purchasing cost of EDGN. Considering the difference in information collection and transmission between the distribution network and the gas distribution network, there may be communication delay and information packet loss. In order to ensure the security and privacy of the information of each energy entity in the EGDN, the asynchronous alternating direction method of multipliers is used to solve the model. The simulation of EGDN system composed of improved IEEE 33-node system and 7-node gas distribution network show that the proposed model can effectively alleviate EGDN voltage fluctuation, reduce network loss and reduce the total operation cost of the system.