This paper presents the impact of substation breaker failure operation on system transient stability and the ways to enhance post-fault transient characteristics. Power System Analysis Simulation Package (PSASP) software is used to stimulate the circuit breaker failure operation in 220KV or 500KV substations. By stimulating all the possible line faults and their corresponding breaker failure conditions in Liaoning electric power grid, breakers that are most likely to cause system transient unstable are researched. Reasons of transient problems are speculated and implied, using equal area criterion. Different transient characteristics led by various fault types are compared. Also, measures that could help improve system transient stability are introduced and compared. Furthermore, a new method which is integrating Thyristor Controlled Series Compensation (TCSC) to the grid weak points is stimulated and verified. Results show that it could reduce generator angle fluctuation significantly. Keywords-Breaker failure operation, System transient stability, Equal area criterion, Tripping time reduction, Thyristor Controlled Series Compensation (TCSC)