Abstract: The microstructures and hardness distribution of P92 welded joint was analyzed, and the creep damages of the joints were observed under various times of creep tests at 650℃ and 70 MPa.It was found that no obvious creep damage was observed in the all zones of P92 welded joints for the 3 000 h creep specimen, many creep voids occurred in fine grain heat-affected zone and intercritical heat-affected zone regions and no creep voids were found in the coarse fine heat-affected zone and the weld metal in 4 032 h creep specimen, the voids grew up and tend to coalesce in 7 000 h specimen, and micro fissures began to form in 7 026 h specimen.Therefore, this creep fracture could be clearly identified as Type IV cracking.