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High-quality Fe-doped TiO2 films are epitaxially grown on MgF2 substrates by pulsed laser deposition.The x-ray diffraction and Raman spectra prove that they are of pure rutile phase.High-resolution transmission electron microscopy(TEM) further demonstrates that the epitaxial relationship between rutile-phased TiO2 and MgF2 substrates is 110 TiO2 ||110 MgF2.The room temperature ferromagnetism is detected by alternative gradient magnetometer.By increasing the ambient oxygen pressure,magnetization shows that it decreases monotonically while absorption edge shows a red shift.The transport property measurement demonstrates a strong correlation between magnetization and carrier concentration.The influence of ambient oxygen pressure on magnetization can be well explained by a modified bound magnetization polarization model.