The invention relates to a Tetra (Terrestrial Trunked Radio) and GSM (Global System for Mobile Communications) dual-mode handset comprising a main control chip respectively connected with a human-computer interaction interface, a Tetra functional block and audio equipment and a GSM functional block connected with the main control chip, wherein the main control chip inputs a program controlling the switching of a Tetra mode and a GSM mode, and the audio equipment adopts a dual-mode selection switching switch. The invention can carry out communication by utilizing a Tetra protocol to quick call and establish trunking communication with the advantages of low background noise, and the like in Tetra network coverage areas but also can carry out communication by utilizing a GSM network with wider coverage ranges in areas not covered by Tetra network.