Abstract: This paper briefly introduces the influence of target torque,target bolt load and elasticinteraction of bolts on flange sealing performance.It clarifies that the proper method for flange joints has great effect on the reliability of sealing performance and construction efficiency.Then the Japanese standard,JIS B 2251—2008：Bolt Tightening Procedure for Pressure Boundary Flanged Joint Assembly is introduced.Combining with ASME PCC-1—2013and previous research achievements,the paper introduces and analyzes the application scope,setting the value of target tightening torque,precautions,loading process,targeted preload acquisition rate and derivation method of the standard.It summarizes that this standard is worth spreading due to its high construction efficiency and low bolt preload discrete degree.