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The transient stability problem of Distributed Generations (DGs) has become one of the constraints for the inter-connection between a large number of DGs and the distribution network. In this paper, DGs connected to the distribution network are divided into DGs based on synchronous generator interface, induction generator interface and inverter interface according to the different DG interface types, and the mathematical models of DG are established based on different interface types. Then through the simulation on the typical one machine infinite bus systems, the paper analyses the transient process and the corresponding fault critical clearing time of DGs under the terminal fault conditions. Finally on the basis of the transient stability analysis of DGs, it puts forward corresponding measures for DGs based on different interface types to improve transient stability. 