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In order to solve the problem of uncertainty in the deployment process of flexible net at low altitude caused by short-time high dynamic and fluid structure coupling phenomenon, a parameter evaluation method based on orthogonal experimental design theory was proposed. Using range method and variance method, the sensitivity due to five parameters, such as projectile velocity, ejection angle, tractor mass, ejection speed and trajectory inclination angle, which affect the air opening effect of flexible net, were studied, and the influence of opening parameters on the performance of open mesh was evaluated. The simulation results show that the developed area of the flexible net mainly depends on the ejection speed, ejection angle and the mass of the tractor; the hang time of the flexible net is negatively correlated with the mass, velocity and angle of the tractor; the effective interception area of the flexible net is positively correlated with the mass, velocity and angle of the tractor. This method can reduce the workload of experimental calculation and data processing, and can be effectively applied to the sensitivity analysis of nonlinear and high dynamic opening process control parameters of flexible net. It can provide theoretical support for parameter design of flexible net.