Post-tensioning prestressed long tubular section concrete pile is made by centrifugal technology and single tubular section with the length of 8 m or more,which has outstanding advantages in the field of port engineering pile foundation.In order to study its mechanical bending property,we analyze the bending property of 1400 mm diameter long tubular section pile,carry out the bending property tests of its tubular section and joints,and monitor the deformation and failure during loading.The results show that the bending property of long tubular section pile is closely related to its concrete strength grade,tension control stress and prestress loss.The production technologies of double-layer end die and graded tension make the new tubular pile have superior bending property.It is a cost-effective pile type suitable for coastal engineering and has wide application prospects.