Abstract: To scientifically and comprehensively evaluate the contribution of the internal resources of virtual power plants (VPPs), deeply tap the potential of the internal resources of the VPPs, stimulate the internal aggregation of distributed energy resources (DERs), actively improve the safety, reliability and economy, and help the development of the integration of source, grid, load and storage, firstly, fully consider the contributions of the internal DERs of the VPPs to the safe operation of the power grid, the balance of power and electricity, and the consumption of new energy, a comprehensive contribution index evaluation system of "safety, reliability and economy" for the internal DERs within the VPPs was established. Secondly, based on fuzzy analytic hierarchy process (FAHP)-entropy weight method (EWM)-technique for order preference by similarity to an ideal solution method (TOPSIS) method, a comprehensive contribution evaluation method of the VPPs was constructed to analyze the optimal selection strategy of contribution degree of distributed energy resources in the VPPs, and the sensitivity of the strategy was tested. Finally, by means of an example, the comprehensive contribution and sensitivity of different types of DERs to the VPPs is analyzed, the optimal selection strategy of internal resources of the VPPs is determined, and the reference suggestions for the internal DERs allocation of the VPPs is put forward.