Abstract: An implementing method for matching the frequency bands of the mobile terminals, a mobile terminal, and a mainboard thereof are disclosed. The mobile terminal involves a signal transmitting/receiving module with at least two frequency bands, a radio-frequency transmitting module, a radio-frequency receiving module and a radio-frequency front-end module. The mobile terminal further involves a first connection selection module and a second connection selection module. The implementing method for matching the frequency bands of the mobile terminals comprises the following steps. The multi frequency bands bonding pad compatibility is achieved respectively on the circuit board by the radio-frequency transmitting module, the radio-frequency receiving module and the radio-frequency front-end module.