With the development and progress of experimental modal analysis technology, MIMO (Muhiple-input, Multiple- output) modal test and analysis method is increasingly widely used. In the paper, certain modal test has been conducted based on MIMO test method. And the paper analyzes the test resuhs, coming to a conclusion that the major modal vibration model is within 100 Hz. Finally, effective modal parameters have been obtained. By analyzing the obtained test results laterally and vertically, the paper verified the test results obtained are real, effective and credible, which provides an effective case for the application of MIMO in practicle project.%随着试验模态分析技术的发展与进步，多输入多输出（MIMO）的模态测试分析方法却被越来越广泛的应用。文章以MIMO法的原理为理论基础，选取某一指定车型白车身进行基于MIMO测试系统条件下的模态试验测试，并分析获得的试验结果，认定该车型在100Hz以内是主要模态振型，最终获得有效的该车型模态参数。对获得的试验结果进行横向和纵向分析，最终认定本次试验真实、有效，为MIMO法在实际工程中的应用提供有效案例．
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