By using Teflon as the rectificating plate, a kind of low equivalent liquid explosive lens with nitromethane was designed. The results of dynamic tests and numerical simulations show that except the inert rectificating plates have effect on the retardation of the explosive shock wave, the difference of velocity of detonation for booster pellet and nitromethane, and strong detonation are the main factors to influence the lens wave. The experimental results indicate that the strong detonation can be reduced by decreasing the thickness of booster pellet.