Abstract: For the problems of obstruction and energy consumption when the negative pressure suction system that developed by our group was used for pneumatic collection of camellia particles, this paper studied the collection performance of the system from three aspects of pipe diameter, ratio of curvature and diameter and conveying gas velocity, numerical simulation of gas-solid two-phase flow of camellia particles in the pipeline was carried out. Numerical simulation was conducted by coupling solution of discrete element method（DEM） and computational fluid dynamics（CFD） to form a discrete element model and a computational fluid dynamics model. CFD was used to solve the continuous gas phase flow field, and DEM was used to solve the motion and force of discrete particles. The simulation results show that the factors influencing the adsorption performance were tube diameter, gas velocity and ratio of curvature and diameter from large to small. While the conveying gas velocity is 38 m/s, ratio of curvature and diameter is 1 and the pipe diameter is 80 mm, the system mass flow rate to achieve the optimal. Kinetic energy and velocity of the particles in different stages and location of the pipe are analyzed under this condition. The orthogonal experiment of adsorptive of prototype was carried out, results show that the pipe diameter has the greatest influence on the adsorption performance, followed by the gas velocity and the ratio of bending to diameter, which are consistent with the numerical results. When the pipe diameter is 80 mm, ratio of curvature and diameter is 1 and the gas velocity is 38 m/s, the optimal test value of mass flow of the negative pressure suction system is 0.66 kg/s and the simulation value is 0.902 kg/s under the same condition. The relative error between them is 26.8%, indicating that the test is basically consistent with the numerical simulation results.