According to the theory of experimental modal analysis (EMA), SIMO analysis method, multi-reference point modal test, experimental modal test and modal parameters identification of the scaled 1:8 car-body’s sidewall were conducted. The test model was built on depending on the proportion of body dimensions; Sensors were arranged and modal test parameters were set; Data collection and analysis were conducted by using hammering method and DHDAS software system, and first four elastic modal parameters and the corresponding mode of its sidewall were obtained by using the Polylscf modal extraction. The results showed that: the 1st modal of the sidewall was 61.6 Hz; the second modal was 120 Hz; the third modal was 125.5 Hz; the fourth modal was near to 139 Hz. By comparing different input type, the 1th modal of scaled car-body was not sensitive to the position of input, the amplitudes of the 2nd, 3rd and 4th modal for the sidewall input were bigger than the case of the roof input, the maximum difference was 5.132 m/s2/N, so this case was sensitive to the position of the input. Signal spectral components were consistent with the modal frequencies, which verified that the results were correct.