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In this work, BiOCl_x/BiOBr_y/BiOI_z (x + y + z = 1) composite nanofibers were prepared through electrospinning and the sol-gel methods. Photocatalytic degradation of trichloroethylene (TCE) by BiOCl_x/BiOBr_y/BiOI_z/PAN nanofibers was systematically investigated via gas chromatography (GC). Optimum photocatalytic activity was achieved with BiOCl_0.3/BiOBr_0.3/BiOI_0.4 fibers under solar light irradiation. X-ray photoelectron spectroscopy (XPS) peaks due to Csingle bondO and Cdouble bondO were observed at 286.0 and 288.3 eV, respectively, it indicated that the BiOCl_x/BiOBr_y/BiOI_z mixture had been successfully doped on the polyacrylonitrile (PAN) fibers. Furthermore, X-ray diffraction (XRD) results also confirmed that we had synthesized the as-prepared composite nanofibers successfully. Photocatalytic activities of BiOCl_0.3/BiOBr_0.3/BiOI_0.4 were up to 3 times higher than the pure BiOCl, BiOBr and BiOI samples …