A tracking method, an electronic device using the same, and a tracking system using the same are provided. The electronic device includes a wireless communication unit, an azimuth detection unit, a storage unit, and a processing unit. The wireless communication unit detects an external wireless communication signal to generate a current RSSI. The azimuth detection unit detects a current azimuth of the electronic device. The storage unit stores pattern strength indicators and a previous azimuth. The processing unit obtains an RSSI adjustment value according to the current azimuth, the previous azimuth, and the pattern strength indicators, and the processing unit further obtains an RSSI corrected value according to the RSSI adjustment value and the current RSSI.