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People pay more attention to the use of FACTS devices to ease grid congestion problems. On the base of the traditional optimal power flow (OPF), an optimal congestion dispatch model with TCSC devices is proposed in this paper, expressing the control of the TCSC over the power systems as additional power equations. Instead of introducing a TCSC controller equation, optimization can be achieved in the variable space including TCSC controlled parameters. Non-linear interior point method (Nonlinear IP method) is used to solve the optimal problems. The results show that the control of TCSC can flexibly adjust the network power flow, and effectively ease the network congestion problems.