Abstract: In response to the pressure of power abandonment caused by large-scale new energy grid integration, the planning and operation mode of cross regional transmission channels, as the core carrier of resource optimization allocation, need to be innovated. The article deeply analyzes the fluctuation characteristics of the power grid under the integration of high penetration renewable energy, and explores the optimization path of transmission channels in dynamic capacity verification, multi energy complementary scheduling, and market trading mechanisms, aiming to provide reference for inter provincial and inter regional power resource mutual assistance.