The concrete for the lining of the passengerdedicated railway tunnels are produced as per the requirements for durable concrete. The raw material quality, workability and transportation and casting technologies of the concrete have their own special requirements. Due to the problems in the construction organization, concrete's workability, concrete construction equipment and working labors, pipe blocking may occur during the pumping of the concrete. On basis of the concrete construction of No. 3 bid section of Hefei～Wuhan passengerdedicated railway, the author summarizes the reasons for the pipe blocking and their prevention measures in the paper.