Abstract: Building energy conservation is one of the important links related to the constnuction of low-car-bon eoonomy , the completion of energy conservation ，emission reduction targets and the maintenance dsustainable economic development.'T'he huge building energy consumption has become a huge burden onthe national economy , so it is imperative to comprehensively save energy in the constnuction industry.'Thispaper takes building insulation structure as the breakthrough point，aiming at the weak thermal insulaionnodes d PC structure in the PC cladding flat-fell seam，the hot and cold bridge cutside the window,through-wall pipe，PC composite external panel connector，PC wall , such as weak,column node. With anet zero energy consumption as the goal discussing the construction principles of heat preservation and heatinsulation of each node. In the meanwhile ，Chenglu 'Tianfu new area emerging industrial park is treated asexample to introduce the optimization design method of high efficiency air heat recovery system and PCoomposite extemal panel connector flat-fell seam，outside the window heat and cold insulation hermeticnode bridge and heat preservation and heat insulaion wall pipe and so on various weak node constnuctionmethods and techmical points. 'The net zero energy consumption building insulaion and air tight joint con-struction method of the case project has good implementation effect，timely handlled the problemn d nodeoold bridge in the construction pioject , significantly improved the air tightniess and node insulation perform-ance of the constnuction project，and provided valuable cpinions for the current construction project.

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