Abstract: According to characteristics of vertical glass edge grinding machine, such as narrow installation space and foul working conditions, based on homemade strain type grinding dynamometer and orthogonal test, the relationships of tangential grinding force F_τ and radial grinding force F_n to grinding wheel velocity v_c, feed speed v_f and chamfer size c were researched and analyzed when grinding glass edge through V-shaped grinding wheel, forecasting models of tangential and radial grinding forces were established. Result show that tangential and radial grinding force increases with the increase of chamfer size c and feed speed v_f, tangential grinding force F_τ decreases with the increase of the grinding wheel velocity v_c, which has slight effect on radial grinding force F_n,. Among grinding parameters, chamfer size c has the most significant effect on grinding force, the second is feed speed v_f, and the third is grinding wheel velocity v_c. The average error is less than 5% between values calculated by grinding force model and actual measuring values.