The shield machine has been applying to many long and largesection tunnels crossing the rivers and seas, which are under construction or under planning. The connecting technology between two shield machines in the tunnel has been used many times in some important constructions abroad, but it has no case reference in China. A preliminary study on the construction method of the mechanicstype connection and civiltype connection and their comparisons and the shield machine design, the measurement technology during connection construction, etc are discussed in this paper. Moreover, some key problems of connecting shield machine are presented, which can be reference of the design and construction of the related constructions.