Single-polarization, single-longitudinal-mode (SLM) erbium-doped fiber laser based on the twisting of polarization-maintaining fiber Bragg gratings (PMFBGs) is proposed and demonstrated. Two uniform FBGs directly written in a homemade polarization-maintaining and photosensitive erbium-doped fiber (PMPEDF) without hydrogen loading by using ultraviolet light from a 248 nm KrF excimer laser as the wavelength-selective component are used in a linear cavity. Owing to the polarization-dependent loss enhanced by the PMFBGs, stable SLM and stable single- polarization operation of the fiber laser are achieved by controlling the birefringence through appropriately twisting the fiber laser cavity.