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This paper studies the characteristics of bond behaviors between FRP and FRP members, and also estimates the effective bond length , develope adhesive mathematical model. 32 cases of double-face shear type bond tests were conducted in this study. Four test variables are used in this test : FRP materials; epoxy type; bond length; finishing method of bonded surface. It is revealed that bond strength is more affected by epoxy type and finishing method of bonded surface than the other test variables. And effective bond length is obtained from the test results. Adhesive mathematical model for FRP members are estimated by analytical method and are compared with test results.