Micro fiber polarization filter is one of micro basic components for optical communication and sensors system. Theoretical analysis based on super mode theory shows that polarizing effect in coupling component of two contacted micro fibers can be achieved when the fibers′ coupling length and diameters are chose suitably, which means unpolarized light can be changed into polarized light after it is through the coupling micro fiber component. Theoretical analysis and design give the geometric parameters for the polarizing effect. Experiments are made to investigate the relationship between degree of polarization (DOP) of the output light and coupling length when two micro fibers are lined parallel to couple. Micro fiber polarization filers based on evanescent field are manufactured. Experiments show that the (DOP) of the output light within the wavelength band of 1545~1560 nm in the micro fiber polarization filers are higher than 90% when the unpolarized light is input, which means the light is polarized. The linear polarization extinction ratio (LPER) of output light at some wavelengths with the band are higher than 24 dB, while output lights at another wavelengths are elliptical or circular polarized light. It means that output lights are polarized according to their wavelengths. The micro component can construct the band-pass wavelength fiber when it is used with an optical polarizer.