Abstract: To analyze characteristics of the flow field of the auxiliary nozzle in an air-jet loom for the further, a 3-D model of the flow field of the auxiliary nozzle is established based on Pro/Engineer, and the numerical simulation on flow field of the auxiliary nozzle for the weft insertion in an air-jet loom is obtained by Fluent. The velocity distributions of the airflow centerline at the exit of the auxiliary nozzle in an air-jet loom are obtained under different air-supply pressures. In order to verify the rationality of the numerical result, the velocities of the airflow centerline at the exit of several kinds of auxiliary nozzles in an air-jet loom are obtained under different air-supply pressures through the experimental test. Then comparison with two results have be made which indicates that overall trend of speed change of the experimental result is basically consistent with the speed curve of the numerical result. To a certain extent, it proves that it is feasibility of the numerical simulation for auxiliary nozzle in the weft insertion flow field by Fluent. Finally, the test of weft traction force on different kinds of yarns for two auxiliary nozzles is obtained respectively. It can be concluded that single-hole nozzle is the best auxiliary nozzle which behaves the air-jet of nozzle with characteristics of high strength, high stability and good cluster.