Compactification is one of the most important techniques for the practicability of continuous wave (CW) DF/HF chemical lasers. In this paper, a new approach to compactification was emphatically studied, which called the Base-Ejecting, CW DF/HF Chemical Laser (BECL, hereafter). By means of ejecting at base area, BECL is able to achieve two aims simultaneously within a relative small volume, first, the static pressure and temperature at the optical cavity are low enough for lasing effectively, second, ...