Abstract: Highly permeable access to the grid of distributed generation and electric vehicles has become an important feature of China’s future power grid. However, it also causes serious harmonic pollution to the grid. The analysis on harmonic characteristics of distributed generation and electric vehicles after their access is the premise to ensure reliability,safety and stability of the grid. In this article, we set up harmonic analysis model of distributed generation and electric cars, and then, using the Fourier transform method, measure the harmonic in grid which including distributed generation and electric vehicle. This paper focused on the research and analysis of the harmonic characteristics in grid which having distributed generation with different access location, access capacity and electric car with different access mode. The results show that, the harmonic content in the power grid is higher when the distributed generation is connected to the first end of the power grid or the access capacity is large and the electric vehicles should use 12-pulse rectifier charger. In all,the harmonic content are high when distributed generation and electric vehicles accessing the grid and the consideration should be given to harmonic suppressor.