本文对平面圆伞两级开伞的过程进行了理论分析。根据充气理论考虑了伞衣空气质量的变化,取物伞系统在开伞过程中所运行的距离为自变量,建立运动方程,求得各个力学参数在开伞过程的变化规律;分析了收口绳切割器延迟时间对第二级开伞载荷以及弹道倾角对最大开伞载荷的影响。理论开伞载荷曲线和空投试验实测曲线相比较是相当符合的。 This article has carried on the theoretical analysis to the plane parachute parachute process. According to the theory of inflation, the change of the air quality of the umbrella canopy was taken into consideration. The distance traveled by the parachute system during the parachute was taken as the independent variable to establish the equation of motion, and the variation rule of the mechanical parameters during the parachute was obtained. Effect of cutter delay time on the second-stage parachute load and ballistic dip on maximum parachute load. The theoretical open-load curve and airdrop test measured curve comparison is quite consistent.