▎ 摘　　要

Twisted bilayer graphene with hexagonal moire patterns have shown a variety of unusual physical and mechanical phenomena. Unfortunately, some residual strain is introduced during the fabrication process of twisted bilayer graphene, leading to the deformation of moire pattern. In this work, we employed water assisted transfer approach to build the suspended twisted bilayer graphene over the microscale holes patterned SiO2/Si substrate. Atomic force microscopy is involved to characterize the moire pattern. Based on reciprocal vectors analysis, a theoretical model was proposed to extract the local strain of twisted bilayer graphene sample. The local strain of twisted bilayer graphene induced by the transfer process as well as the biaxial tensile stretch was evaluated respectively.