A card edge connector includes an insulative housing and two rows of terminals. The insulative housing includes two side walls. The terminals include signal terminals and grounding terminals each having a retaining portion, a contact portion, and a soldering portion. Two adjacent terminals in each row constitutes a terminal pair. The soldering portions of each terminal pair are aligned with each other in a longitudinal direction and the soldering portions of an adjacent terminal pair are deviate from each other in the longitudinal direction so that the soldering portions of the two rows of the terminals are arranged in four rows. The terminal pairs include three types of arrangement and in each arrangement the soldering portions of the ground terminals are placed next to the soldering portions of the signal terminals in the closest way in order to reduce interference during transmission.