介绍一种基于预试验（Pre-test）的车身动态性能试验方法。首先介绍了Pre-test的理论及激励点与响应点选取原则和流程，通过Lms.Virtual.Lab的预试验功能实际确定车身试验模态中响应点的数目，位置及激励点位置和方向，并通过与Lms.Test.Lab的接口功能，导入到Test.Lab进行模态试验，通过合适的试验模态方法与参数的选取，得到准确清晰的模态辨识结果，验证了基于Pre-test的车身动态性能试验模态分析方法的正确性。

A new Modal test method of BIW’s dynamic characteristics based on Pre-test is introduced in the paper. Theory about Pre-test and principle on determining response and reference points are presented firstly. Then It is decided that locations and direction of reference points and the locations and number of response points through the Per-test module of Vritual.lab on a actual BIW. The modal test process is indicated generally and the results are displayed at last. It is clearly that the Modal identification is easier and distinct. The validity is approved