On March 6th, the shield machine of the left line of the first phase of Xuzhou Metro Line 4 between Taishan Road Station ~ Jiahe Road Station was successfully launched. The design length of the left line tunnel between Taishan Road Station ~ Jiahe Road Station is 844.774m. According to the professional requirements such as the line and the requirements of disaster prevention and evacuation, a communication channel will be set up. Three sets of curves are set up in the plane of the section: R=1200, 1000 and 600, and the signal tower, rainwater tank culvert and other structures are passed along the line. In order to ensure the on-time, safe and smooth launch of the shield machine, the project department continuously optimizes and improves the shield construction plan, invites experts to conduct on-site demonstration and review for major hazards and risk points, carefully analyzes, fully demonstrates and strictly strengthens process control, and provides on-site guidance from safety officers and technicians, which provides a reliable safety technical guarantee for the smooth start and progress of the shield machine. The project department optimizes the allocation of production forces to ensure that the shield starts on schedule and completes the node tasks on time.