Considering the influence of defect type, defect position and defect length on the connection performance of fully grouted sleeve joint, 57 specimens were designed for uniaxial tensile test to study the influence of grouting defect on its failure mode, load displacement curve, strain distribution and bearing capacity. The utilization rate of bearing capacity and bond strength were analyzed, and the grouting quality was evaluated. The results show that the failure modes of the specimens are steel bar breakage, steel bar pull-out failure after grouting material shearing and steel bar plough pull-out failure；With the increase of defect length, the symmetrical defects on both sides are significantly affected. When the defect length is greater than 1d, the central defect has the greatest impact on the specimen；The strain distribution on the sleeve surface is the largest in the middle position, followed by the grouting opening position, the grouting opening position is the smallest, and the middle position of the sleeve is the weakest position. Except for pulling out the damaged specimens, the lowest utilization rate of bearing capacity is three times the defect length of reinforcement diameter of symmetrical bottom defect type.