Delivery of military equipment in order to guide operations, on the basis of Newton’s second law of motion, air force of the umbrella system made up of parachute and equipment and the relationship between air density, temperature and air pressure is analyzed and coefficient differential equation model of equipment drop under the condition of wind and change of air density is established. The relationship between the speed, angle of attack, landing time, landing position of the equipment at the process of drop and the flying height and speed of the plane and the parachute is researched. Meanwhile, the process of the parachute dropping is simulated through constant coefficient differential equation model in virtue of software MATLAB and the dropping position is predicted with consideration of random factors in virtue of Monte Carlo method. The study of practical training and combat has a good reference value.