Abstract: The penetration of renewable energy sources(RES) into the electricity system has increased significantly over the past few years due to growing global concerns about climate change. However, there are significant problems in integrating renewable energy sources into the electricity market. Renewable energy outputs, such as wind power and photovoltaics, are highly uncertain. Their correlation with load demand is not always guaranteed, thus reducing system reliability. In order to solve these problems, virtual power plant(VPP) is gaining attention as an innovative solution to improve the stability of power systems. Virtual power plants mitigate the impact of uncertainty by aggregating multiple distributed energy resources, which improves the flexibility and responsiveness of the system, nevertheless, uncertainty is still an important factor to be studied in virtual power plants. Uncertainties are classified into: source-side-renewable energy uncertainty, load-side-load demand uncertainty and demand response uncertainty. On the basis of this classification, the relevant conceptual structure of virtual power plant, its development history and uncertainty in virtual power plant are introduced, then the methods of dealing with uncertainty are compared and analyzed, then the above classifications, uncertainty analyses, and methods of dealing with their uncertainty are described, respectively, and finally the direction of the future research on uncertainty in virtual power plant are prospected.