A novel bending sensing scheme based on intermodal interference of dual-hole polarization maintaining photonic crystal fiber (PM-PCF) is presented. The finite difference beam propagation method is used to analyze the bending characteristics of dual-hole PM-PCF. The relationship between normalized interference output intensity of two low order polarization modes and bending radius is calculated thoroughly when the dual-hole PMPCF is modulated by bending. Further, the wavelength influence of bending sensing characteristics is discussed theoretically. And an experiment system is set up to verify the feasibility of bending sensing based on intermodal interference in dual-hole PM-PCF. The experimental results show that the bending sensor designed in this paper has excellent linearity and accuracy when the bending radius ranges from 10 mm to 30 mm.