As rapid growth of load in Chongqing and the tightness of Sichuan-Chongqing operation mode coupled, distribution of power in the transmission path from Sichuan to the east appears to be unbalanced seriously under the operation mode of heavy load. So the power transmission capacity of Sichuan-Chongqing is limited. Optimization models of optimal generation dispatching and construction of interconnected grid structure are proposed respectively to improve the capacity of power transmission from Sichuan to the east based on the DC power flow model. Optimization results of optimal generation dispatching and construction of interconnected grid structure are supplied by using optimization toolbox to solve the optimization models respectively. Application effect of the schemes shows that both optimal generation dispatching and construction of interconnected grid structure can improve power transmission from Sichuan to Chongqing. The effect of construction of interconnected grid structure is better, but its engineering cost is higher. Field technicians can choose the suitable scheme to implement based on actual conditions and requirements.