本文较全面地讨论了当采用不同的振动法,即自由振动法和强迫振动法时,用半模型测定飞行器纵向动导数的基本原理和实验方法。介绍了自行设计、制造的动天平概况。根据在我院250×200mm~2高速风洞中对三角翼的初步测试结果,与FFA62实验结果相比较表明该动天平是适用的。但在实验中发现不少问题,故在文章最后部分提出了改进的意见和今后努力的方向。 This paper discusses the basic principles and experimental methods for the determination of the longitudinal dynamic derivatives of a vehicle when using different vibration methods, that is, free vibration method and forced vibration method. Introduced self-designed, manufactured moving balance profile. According to the preliminary test results of delta wing in 250 × 200mm ~ 2 high speed wind tunnel in our hospital, the comparison with FFA62 shows that the moving balance is suitable. However, many problems were found in the experiment. Therefore, the opinion of the improvement and the direction of future efforts are put forward in the last part of the article.