A new electronic target based on the principle of the non-diffracting beam is proposed for guidance of shield machine. The spot center location of the incident laser of the total station in CCD fixed in the electronic target and the angle data of the total station are combined by constituting mapping database. The actual attitude angles of the electronic target and the center of the head of shield machine are computed by mapping database and the angles of electronic gradienter. The errors of the total station and components of the electronic target in measuring process are analyzed. The errors of attitude angles and the center of the head of shield machine are derived. The result shows that the measuring precision of the head of shield machine by the electronic target could reach a millimeter-level, which could meet the requirement of the shield machine guidance precision.