Coupling of scattering light in space into fiber has also been used widely in many fields. However, when the scattering objects is big, how to coupling of scattering light in space into fiber efficiently is seldom studied. Considering that coupling efficiency and the field of view are important parameters of a fiber optic based receiver, the coupling efficiency with different axial and racial offsetting or different input angles was analyzed, then the coupling efficiency and field of view of the fiber optic receiver was compared by theoretical analysis and emulation.