Abstract: A new method of analyzing the dynamic wetting of fiberglass with infiltration liquid by linear regression analysis was proposed. The dynamic wettability of fiberglass surface was characterized, combining the use of precision electronic balance. The results show that the dynamic contact angle has an increasing trend with the increase of wetting velocity during the dynamic wetting process of fiberglass. Precisely, the contact angle of fiberglass and deionized water, ethylene glycol, 760E epoxy, CYD128 epoxy can increase from 66.04°, 42.21°, 51.31°, 73.90° to 69.05°, 46.95°, 74.58°, 170.06°, respectively, while the wettability of the fiberglass decreases. When the wetting rate increases, the greater the viscosity is, the faster the wettability declines during the dynamic wetting process of fiberglass. That is, the contact angle of fiberglass and CYD128 epoxy decreases by 96.16°, whereas the figures for 760E epoxy resin and ethylene glycol are 23.27° and 4.74°, respectively. Based on the new method, the force applied against the fiberglass increases with the rise of the moving velocity of three-phase contact line and the viscosity of infiltration liquid in the dynamic wetting system.