Abstract: The construction mechanic combines structure mechanic and constructiontechnology together. Its main feature isthat the geometry profiles, the physical properties and the boundary conditions of a research object will change withconstruction duration. It is evident that the different construction processes and procedures will lead to different deformationand internal force distribution locked within a structure after the construction is ended. Therefore a structural design statemust be estimated accurately if a construction finished structure meetsthe design andservice requirements. Itwillbe focusedon the construction mechanic problems which are explored from many large and complex steel structure construction anderection processes currently. The ten key construction mechanic problems have been pointed out, and they are analyzed anddiscussed comprehensively. The discussion on these problems has of great importance to further developing constructionmechanics and engineering application.