A wireless communication terminal, comprising a baseband working unit and a radio frequency, RF, working unit, and a direct current, DC, power converter connected with both said baseband working unit and said RF working unit, said wireless communication terminal further comprising: a central processing unit, CPU, (14;402) and an envelope detection device, wherein: said envelope detection device is connected with said RF working unit and is configured to detect an envelope signal of the output signal of a power amplifier, PA, comprised in said RF working unit in real time, and send said envelope signal to said CPU (14;402); said CPU (14;402) is connected respectively with said DC power converter and said envelope detection device, and the CPU (14;402) is configured to: receive a voltage provided by said DC power converter, and convert said envelope signal sent by said envelope detection device into a control signal; characterized in that the wireless communication terminal further comprises a power supply device (15;401) and an Inter Integrated Circuit bus connecting the power supply device (15;401) to the CPU (14;402); in that said power supply device (15;401) comprises an Inter Integrated Circuit bus interface and is configured to provide an output voltage to the power amplifier, PA, in said RF working unit, receive a control signal sent by said CPU through the Inter Integrated Circuit bus, and adjust said output voltage according to said control signal, so that an amplitude of the output voltage of said power supply device (15;401) with the Inter Integrated Circuit bus interface follows change in an envelope curve of an output signal of said PA; and in that said CPU (14;402) is configured to send the converted control signal to said power supply device (15;401). said envelope detection device is connected with said RF working unit and is configured to detect an envelope signal of the output signal of a power amplifier, PA, comprised in said RF working unit in real time, and send said envelope signal to said CPU (14;402); said CPU (14;402) is connected respectively with said DC power converter and said envelope detection device, and the CPU (14;402) is configured to: receive a voltage provided by said DC power converter, and convert said envelope signal sent by said envelope detection device into a control signal; characterized in that the wireless communication terminal further comprises a power supply device (15;401) and an Inter Integrated Circuit bus connecting the power supply device (15;401) to the CPU (14;402); in that said power supply device (15;401) comprises an Inter Integrated Circuit bus interface and is configured to provide an output voltage to the power amplifier, PA, in said RF working unit, receive a control signal sent by said CPU through the Inter Integrated Circuit bus, and adjust said output voltage according to said control signal, so that an amplitude of the output voltage of said power supply device (15;401) with the Inter Integrated Circuit bus interface follows change in an envelope curve of an output signal of said PA; and in that said CPU (14;402) is configured to send the converted control signal to said power supply device (15;401).