With the large-scale development of renewable energy sources such as wind and light, the problem of abandoning wind and light is becoming increasingly serious. In order to transmit large-capacity wind and solar resources to the load center over a long distance, this paper analyzes the power output characteristics of wind-solar hybrid energy for long-distance high-voltage transmission with rich wind and solar resources, and proposes a method for determining the transmission capacity of wind-solar hybrid power generation based on confidence; At the same time, considering the factors such as the uncertainty of the source output, the economic and technical characteristics of DC transmission, a long-distance DC transmission evaluation index system for wind-solar hybrid energy is proposed. Finally, the candidate schemes are comprehensively optimized based on the regret theory method. The calculation example shows that the selection method proposed in this paper can effectively combine the source characteristics and transmission cost to establish different schemes, and give the applicable scope of different transmission schemes, so as to provide guidance for long-distance transmission planning of renewable energy.