Qian Xuesen's ballistic principle is a paper published by Qian Xuesen, a famous physicist, professor and doctoral supervisor in China in the 1980s. He put forward the following six principles, thus forming a mature ballistic theory.

First of all, the motion of an object is influenced by force and gravity. Secondly, the direction of stress is not evenly distributed, but has certain heterogeneity, that is, the direction of stress is determined by external conditions and the shape and size of an object. When an object is subjected to different forces, its motion state is also different; Thirdly, when an object moves, the scale of time and space is very important, and the motion state changes with the change of time and space;

Fourth, the trajectory is random, but it has certain regularity; Fifth, the trajectory of the object under the action of force is scattered, not concentrated; Finally, due to the influence of external environment, such as temperature and humidity, the stress state of the object will also change.

Through the above six criteria, Qian Xuesen's ballistic principle constitutes a complete ballistic theory, which holds that when an object moves, the trajectory caused by the change of force will also change, which is related to the external environment, thus affecting the state of the object's motion, thus forming a dynamic ballistic system and making the object's motion in a dynamic equilibrium state.

The discovery of Qian Xuesen's ballistic principle is of great help to understand the motion of objects and calculate their trajectories. It provides an effective method for how to calculate its trajectory and how to change the orientation of the launched object. At the same time, it also helps us to better understand the flow of liquid and explore the law of how matter works in the universe.

In practice, Qian Xuesen's ballistic principle is applied to space technology, which can calculate the trajectory of launched objects more accurately, thus greatly improving the success rate of space missions. In recent years, with the continuous development of science and technology, Qian Xuesen's ballistic principle has been continuously applied to various fields, such as aviation, aerospace and oil exploration. In addition, Qian Xuesen's ballistic principle plays an important role in military strategy and air combat technology, and is widely used in designing hacker technology and space weapon system.

In a word, the discovery of Qian Xuesen's ballistic principle has greatly promoted the progress of science and technology and played an indelible role in the improvement of human living standards and the economic development of the country.