Transient Liquid-phase Bonding ( TLP bonding ) is a new technology on pipeline welding. T91 steel pipe was proceeded on TLP bonding and arc welding with metal inert-gas arc welding by contrast test. Mechanical and microstructure property of T91 steel pipe joint with TLP bonding was researched. The effects of different welding on technological parameter were compared． The result showed that on productivity, cost and labor health TLP bonding is bigger than arc welding with metal inert-gas arc welding with equal in quality.