The only head driving distance of the engineering of Beijing underground diameter line is 5.2 km, thus controlling the precision of tunnel transfixion is difficult. Based on the analysis of the measuring accuracy, only through the wire line can not satisfy the design requirements of provisions error limit. Eventually, methods like wire directly orientation, adding the gyro in the tunnel and control net of wire of ground and underground in close connection are determined. These increased the lateral error precision of piercing,and achieved expected effect.