In　the　aero-engine　hardware-in-the-loop　simulation　test,　the　compressor　outlet　pressure　simulation　is　an　important　part.　In　order　to　simulate　the　sudden　change　of　airflow　in　the　process　of　compressor　destabilization,　a　high-precision　pressure　simulation　system　is　designed,　through　which　a　real　pressure　signal　is　generated　to　provide　an　accurate　pressure　excitation　for　the　full　authority　digital　engine　control.　A　multi-mode　acceleration　switching　strategy　is　proposed　according　to　the　characteristics　of　the　switching　valve,　and　the　acceleration　drive　waveform　and　generation　method　are　designed　to　combine　with　the　field-programmable　gate　array　module　to　accurately　output　the　acceleration　waveform　and　improve　the　opening　and　closing　speeds　of　switching　valve.　A　seven-mode　switching　method　is　designed　based　on　the　traditional　three-mode　and　five-mode　switching　methods.　The　backstepping　sliding　mode　controller　is　combined　with　the　seven-mode　switching　method　to　improve　the　control　accuracy,　and　the　stability　of　control　system　is　proven.　The　test　results　show　that　the　maximum　average　overshoot　in　the　steady-state　pressure　test　is　1.　25%,　and　the　maximum　average　steady-state　error　is　0.　016　MPa.　The　average　errors　in　the　random　step　response　and　sinusoidal　tracking　tests　are　less　than　0.　02　MPa.　The　proposed　pressure　simulation　method　can　meet　the　requirements　for　high-accuracy　pressure　simulation　of　aero-engine　hardware-in-the-loop　simulation　tests　and　achieve　the　accurate　pressure　simulation　at　a　low　cost.　©　2024　China　Ordnance　Industry　Corporation.　All　rights　reserved.