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Aiming at the simulation problem of aero turboshaft engine speed and torque signal, the principle of detecting engine speed and torque and signal characteristics are analyzed. A new method of synthesizing simulation signal on ZYNQ platform is proposed. The design based on direct frequency synthesizer. The parameters of resolution, data bit width, spurious free dynamic range are calculated to analyze the influence on accuracy. Two synchronous digital sinusoidal signals are generated by setting the frequency and phase through on-chip high-speed digital bus which is AXI4 in order to ensure the real-time performance. The output of simulation signals are realized by comparison, filtering and synthesis. In terms of hardware, the digital-to-analog conversion and signal conditioning circuits are used to optimize the device selection on the premise of ensuring various performance indicators. The output interface protection is added to avoid the faults caused by static electricity or misoperation. The actual application shows that the simulation signal has high accuracy and reliable operation. It has been applied to several experimental projects of aero turboshaft engines.