Abstract: HPR1000 is designed to resist the impact of large commercial aircraft,the outer containment and shield building are used to protect the reactor building,fuel building and electric building. As a typical high suspended long-span heavy concrete structure,there is much difficulties in the roof construction of the shield building,such as large construction load,long-span,without reliable construction platform and so on. According to its structural and mechanical characteristics,several construction schemes are proposed,full-hall scaffold,pre-casted concrete beams,steel beams and layered pouring method. Then,layered pouring method was used in the project,after scheme comparisons considering the construction safety,difficulties,period,and cost,etc. After that,design of layered pouring scheme is introduced thoroughly,mainly on the design principle and method,design content,and results. Also,the construction technical requirements are proposed. The construction difficulties are solved using concrete layered pouring scheme,and the shield building roof has been successfully constructed. Additionally,the layered pouring scheme may be referenced by construction of such high suspended,long-span and heavy concrete structures in the following-up nuclear power plants,nuclear chemical industry,and also other industries.