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This article mainly aims at experiments to modify the matrix phase in glass fiber-reinforced plastics anchor (GFRP-anchor), trying to achieve the enhancement in the torsional performance of GFRP-anchor in order to expand its application field. The experiments were to add the mineral filling nano mullite powder and the toughening agent acrylic-polyurethane emulsion with different proportions into the matrix phase which experienced a vacuum-pumping process for the removal of bubble, while the same reinforced phase glass fiber was used by all the GFRP-anchor samples with the same forming process conditions. Torsion test and scanning electron microscopy (SEM) observations were investigated, and the results revealed that adding nano mullite powder into the matrix phase as the mineral filling with the mass fraction ratio of 1.5%, the acrylic polyurethane emulsion as the toughening agent with 5%, as well as the vacuum-pumping process for the removal of bubble from the matrix phase, can greatly improve the torsional strength of the GFRP-anchor by 35%, 41%, and 51%, respectively.