Abstract: An aeroengine model can be identified from actual closed-loop engine test data if pseudorandom binary sequence as test signal acts on feedback circuit of the closed-loop control system. The fuel flow excited by PRBS is the input signal of the engine identification and the speed is the output. The model parameter values are consistent and unique estimation when burning delay of the engine burner is.This paper presents the identification test method that has been applied to Spey MK202 engine at the testbed and discusses the test signal analysis method that has been implemented at data processor. The model parameters of engine have been identified by use of Hsia method. The model examination shows that the result obtained with this method is satisfactory.