In order to know machining characteristics of GFRP, special unidirectional glass fiber reinforced plastic specimens were cut orthogonally under a dry condition. The effects of the direction of yarn with the cut surface and the radius of cutting edge of the tool upon the aspect of failure of the yarn and the cutting force were investigated.The fracture mode of glass yarn was found to be affected by the radius of cutting edge of the tool. The depth of the failed part of yarn from the cut surface became maximum when the direction of yarn was at a certain angle with the cutting direction. The cutting force for the yarn was strongly affected by the direction of yarn with reference to the cutting direction.