A polygon space is the moduli space of polygons in Euclidean space with a fixed length, appearing in various mathematics branches. In this talk, we will discuss the moduli space of polygons in the 3-dimensional Euclidean space from the perspective of Lagrangian Floer theory. In particular, I will discuss Fukaya-Oh-Ohta-Ono’s disk potential function of bending torus fiber in smooth and monotone 3D polygon spaces. This is based on joint work with Siu-Cheong Lau and Xiao Zheng.