A terminal holder structure installed in a RJ45 dual-port jack is disclosed to include a plastic intermediate bracket mounted on a middle part of a circuit board to hold the 3rd and 5th terminals of a first set of terminals numbered from 1st through 8th and the 3rd and 5th terminals of a second set of terminals numbered from 1st through 8th in reversed directions so that the distance' between the 3rd and 5th terminals of the first set of terminals and the 3rd and 5th terminals of the second set of terminals is extended for crosstalk compensation to avoid crosstalk interference in the RJ45 dual-port jack.