该文提出从飞行体自由飞行试验中提取空气动力系数的新方法——Ｍａｒ－ｑｕａｒｄｔ改进法。Ｍａｒｑｕａｒｄｔ法综合了Ｃｈａｐｍａｎｎ－Ｋｉｒｋ法和最速下降法的优点而避开了它们的缺点，是一种比较好的数据处理方法。Ｍａｎｑｕａｒｄｔ改进法既继承了Ｍａｒｑｕａｒｄｔ法的优点，又大大地减少了计算工作量，是一种收敛更快的迭代算法。最后，文中给出了在靶道实验数据处理中的计算实例。 This paper presents a new method of extracting Aerodynamics from free-flight experiments of flying bodies, the Marquardt improved method. The Marquardt method is a better method of data processing because it combines the advantages of the Chapmann-Kirk method and the steepest descent method to avoid their shortcomings. Manquardt’s improved method not only inherits the advantages of Marquardt’s method, but also greatly reduces the computational workload. It is a faster convergence iterative algorithm. Finally, the calculation examples in the experimental data processing of the target track are given.