Combining a long-focus lens with a continuous medium gas target is a scheme with high conversion efficiency in high-order harmonic generation. The quasi-phase matching technique is applied to this scheme. It is expected to further improve high-order harmonic signal intensity. A multi-jet arrays gas target is applied to the generation of high-order harmonic, which is designed according to the quasi-phase matching technique. It is theoretically confirmed by numerical simulation that the multi-jet arrays gas target could improve the harmonic signal intensity compared with traditional continuous medium gas target.