Abstract: A continuous wave DF/HF chemical laser adopting TRIP technique has been numerically studied. According to the 3 dimensional flowfield with chemical reaction and without lasing, the simulation results show that the mixing enhancement of TRIP jets is obvious. The flow streams diffuse more quickly to the central line of the secondary nozzle (about 5 mm behind the nozzel exit plane), and the small signal gain is higher than that in the cases without TRIP jets. The mixing mechanism is analyzed to be stretching and distorting the interface between main and secondary streams. The TRIP jets creat weak vortices at the same time which dissipate soon after generation and affect the flowfield mildly.