Abstract: Mechanical performance，transversal stress and displacement of one tube composite bonding-type an- chorage was analyzed by using finite element method and introducing the concept of anchorage efficiency． The aim is to investigate the mechanical performance of bonding-type anchorage as well as the parameters' effects on the an- chorage efficiency，to find out the optimized parameters of anchors，and to solve the problems of anchorages and promote the applications of CFRP (Carbon Fiber Reinforced Polymer) in large-span bridges． Furthermore，based on the concept of anchorage efficiency and equivalent stiffness，the effects of anchors' length，elastic modulus of bond medium，length of straight tube，inner angle of barrel，thickness of tube as well as diameters of CFRP ten- dons on the anchorage efficiency were studied by changing the parameters of models． Results show that the anchors' length is suggested to be 12 to 16 times of the diameters of CFRP tendons; the elastic modulus of bond medium is suggested to be 1. 5 GPa to 3. 0 GPa; the length of straight tube is suggested to be 1/6 to 1/2 of anchors' length; the inner angle of barrel is suggested to be 4° to 5°; the thickness of medium is suggested to be 0. 3 to 0. 5 times of diameters of CFRP tendons; the diameters of CFRP tendons is suggested to be less than 90 mm． Under the sug- gested parameters，the anchorage efficiency can reach 90% ～95% or even more． Hence，it does help to promote the anchorage efficiency and equivalent stiffness by optimizing the parameters of anchors．

Key words: bridge engineering, anchorage performance of CFRP tendons, finite element method, bonding-type anchor