Grey relational analysis has the advantage of modeling with poor data which probability statistics or fuzzy mathematics can't deal with.Based on the test data of bond between glass fiber reinforced polymer(GFRP) rods and concrete,the technique of analyzing the influence parameters to bond performance using grey relational method is presented in this paper.The influence parameters include the diameter,rib height and rib spacing of GFRP rods.The results of grey relational analysis indicate the influential ord...