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It is widely used to control the total active power under restriction for one set of tie lines in real operation electric power system. So it is very important for operators to grip the transmission capacity of one set of tie-lines. In order to facilitate the real-time monitoring of the operation of power system, a principle and method is proposed to define the cross-section of transmission line. Operation mode is divided into two parts: generation mode and load mode. A mode identification method is proposed to range the regions according to the oscillation angle of typical unit. The analysis and stability control method of maximum transfer power at cross-section based on operation mode is proposed considering transient stability constraints. Examples show that the method proposed is simple, reliable and can fulfil the need of the operation of power systems.