This invention discloses a method for filtering multiple paths of radio links in low operation volume including: setting a flag register for an antenna and setting its position, taking out a multi-path with the highest energy from a being filtered multi-path set to check the place and right and left d-1 corresponding to the offset in the flag register based on the number of the antenna and its offset, and d expresses the smallest space of the effective multi-path, if the selected place is the same with the set one, it shows that the space between the current path and the selected one meets the requirement and it is an effective one, it not, it shows the space does not meet the requirement and is rejected, after the filtration, the place corresponding to the offset and right and left d-1 are placed in the flag register corresponding to the multi-path. This invention also discloses a device.