Control method and control module for multiple-antenna device

A control method for multiple-antenna device comprises transmitting wireless packets to a plurality of antennas of the multiple-antenna device by a wireless transmission device; sequentially selecting one of the plurality of antennas to connect with a wireless chip by a performance optimization unit, for sequentially acquire receiving data rate corresponding to each one of the plurality of antennas; using a designated receiving antenna to receive wireless packets from the wireless transmission device by the performance optimization unit during a transmission period, and inserting a test time-interval to use a stand-by receiving antenna replacing the designated receiving antenna for receiving wireless packets from the wireless transmission device; and selecting the stand-by receiving antenna as the updated designated receiving antenna by the performance optimization unit when the receiving data rate during the test time-interval is larger than that during the transmission period. Thus, receiving data rate of t