To study the effects of lap length and rebar diameter on the mechanical properties of typeⅡAPC connector, 63 specimens were subjected to uniaxial tensile test, and the failure mode, ultimate bearing capacity, ductility, and bond stress of the connector were analyzed. Test results showed that with the same diameter of rebars, as the lap length increased, the average bond stress decreased, and the strength, ductility, and total elongation at maximum force of the specimen had significantly increased. The residual deformation had decreased overall. The strength, ductility, total elongation at maximum force, and residual deformation of the specimen with tensile failure of rebars met the requirements of the specifications. During the loading process, the short side longitudinal and long side circumferential directions of the middle section of the sleeve were always under tension. Under ultimate load, as the lap length increased, the circumferential compressive strain on the short side of the middle section of the sleeve first transformed into tensile strain and then developed towards compressive strain, and the longitudinal compressive strain on the long side transformed into tensile strain. When the relative lap length was the same, the ultimate bearing capacity increased with the rebar diameter increased. The proposed formulas for calculating the ultimate bond strength and critical lap length are in good agreement with experimental values, and provide references for practical engineering applications. Under uniaxial tension, when the diameter of the rebar is not greater than 18 mm, it is recommended that the connector lap length should be greater than 12d.