The influence of parameters on the secondary fluidic thrust vectoring is simulated with computational fluid dynamics methods. Firstly, a rectangular nozzle is simulated via MFlow solver, and the solver is validated by comparing the computed results, the experimental data and the literature results. On this basis, the influence law of various parameters, such as pressure ratio of the main flow and secondary flow, position and width of the ejecting gap, on the secondary fluidic thrust vectoring is analyzed. Finally, valuable data and meaningful conclusions are obtained, which are helpful to the design of the exhaust nozzle for fighter planes.