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Deformation of some air holes often occurs during the fabrication process of photonic crystal fibres (PCFs). Effects of the location and size of deformation holes on the properties of actual triangular lattice PCFs are investigated in detail. Numerical results demonstrate that the properties of PCFs, especially birefringence, are sensitive to the location and size of deformation holes. These would be very helpful to improve the fabrication technique of the PCF and also offers an efficient way to design high birefringence PCF.