This paper introduces an input method in detail based on embedded Linux and Qtopia matrix keyboard. By reimplementing the Qt event filter, combined with signal and slot mechanism to deal with the use of two-tier status, it is possible to use the definition of the effective input to simplify the input process, reduce the number of pressing button, and enhance the efficiency of input. At the same time, with the use of Qtopia graphical display, the input interface is clearer and more applicable to the embedded device.