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In the mechanical test of solid rocket motor, different installation methods will affect the response of piezoelectric accelerometer, which will affect the final experimental results. Through the establishment of the mechanical theoretical model, it is found that the resonant frequency of the piezoelectric accelerometer installation is directly proportional to the connection stiffness between the accelerometer and the test piece. Compare the sensitivity amplitudes and relative deviation of piezoelectric accelerometer under different installation methods by setting up multiple groups of comparative experiments. The installation method of 502 glue can meet the requirements of high precision, long test time and wide test frequency range at the same time, while the installation methods of bakelite base, magnetic base, magnetic base + 502 and double-sided glue have different use restrictions. And the applicable range of piezoelectric accelerometer under different installation methods is obtained. At the same time, by comparing the transmission coefficient of piezoelectric accelerometers installed in 180°coaxial installation and direct installation with the change of frequency, it is further verified that direct installation can avoid the deviation caused by multi-level transmission.