Control method and control module for multiple-antenna device

A control method for a multiple-antenna device comprises: transmitting wireless signal to a plurality of antennas of the multiple-antenna by a wireless transmission device, transmitting received wireless signal to a wireless chip through a SNR ratio controller of a performance optimization unit by the plurality of antennas; obtaining RSSI for each of the plurality of antennas, and transmitting the RSSI to an application program by the wireless chip; selecting an antenna having the greatest RSSI as a designated receiving antenna when the difference of the RSSI of the plurality of antennas is greater or equal to a first threshold; otherwise, raising the SNR ratio of the received wireless signal by the SNR ratio controller, then obtaining receiving data rate of each of the plurality of antennas and selecting an antenna having the highest receiving data rate as the designated receiving antenna. Thus, receiving data rate of the multiple-antenna device can be improved.