For the application of distributed power flow algorithm in distributed DTS， a method called distributed dynamic power flow algorithm based on asynchronous iteration mode considering frequency changes is proposed. Models of two different levels are used to represent the interconnected system， including coordinate layer and subsystem model， generator unit and network unit models. Coordinate layer is modeled in superior dispatching center. The generator unit is used to distribute the electromagnetic power in the network unit and simulate frequency of the system. In network unit， the power flows are calculated with distributed algorithm based on asynchronous iteration mode. By iterative calculation between generator unit and network unit， the simulation of the frequency change and power flow solution can be obtained. The IEEE 118 node expanded system is taken as an example to authenticate this method and the results indicate that the algorithm is accurate.