In order to analyze the influence of injection total temperature and injection pipe shape on fluid throat area control, numerical simulation was performed on fluid throat control of 2-dimensional convergent-divergent nozzle. Results show that the efficient of throat area control (ETAC) increases gradually along with the increase of injection total temperature; compared the two fluidic nozzles, injection pipe in convergence shape has higher ETAC under lower injection pressure ratio(SPR), while injection pipe in convergence-divergence shape has higher ETAC under higher injection pressure ratio; as SPR increases, ETAC first increases and then decreases; a higher velocity of the injection on injection exit can lead to a higher injection ETAC. Keywords: 2-dimensional nozzle; fluid throat control; injection; numerical simulation