Abstract: In order to solve the problem of static voltage stability caused by distributed generation access to distribution network, this paper mainly investigates the voltage stability of active distribution network including distribution network. To reflect system voltage stability of each node, a voltage stability index method is firstly proposed according to the results of power flow calculation for the whole distribution network to. Considering distributed generation as a negative load direct injection, different models of distributed generation in power flow calculation are then established. Finally, taking the typical wind power of distributed generation for example, active distribution network of IEEE-33 nodes is simulated. The influence of different fan efforts, fan access position and active power fluctuation on voltage stability of active power distribution system is analyzed in detail. The simulation results show that distributed network with distributed generation can effectively improve the voltage stability.