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This article tailored the dispersion and increased the birefringence in a photonic crystal fiber (PCF), and then designed a dual function of dispersion flattened / polarization maintaining PCF (DF-PM-PCF). The numeric results indicate that the DF-PM-PCF achieves the dispersions within a window of 0±1.0 ps/nm/km over a bandwidth range of 679 nm(1235 nm∼ 1914 nm). In the meanwhile, the birefringence values of the DF-PM-PCF were estimated and shown that they are larger than 0.30 × 10−3 in the operating band. Furthermore, the confinement losses of the device are calculated and confirmed that they are reasonable. The numeric results indicate that the DF-PM-PCF has confinement losses of 5.5×10−4 dB/km to 1.4×10−2 dB/km in the operating band.