Abstract: The tubular textile composite material was lined in the pipeline by inversion , as " pipe in pipeline" to rehabilitate the pipeline ; subjected to the inversion press and medium press , it s intensity affect s the rehabilitation
result . Adopting the correlative theories of material mechanics and engineering hydromechanics , an intact calculation formula to calculate the st ress during inversion and lining in pipeline was established , and taking the example of the repaired gas pipeline , the intensity in the axial and circle directions of the tubular textile composite material was designed. The result s show that the st ress in the axial direction is twice that in the circle direction ; and the st ress in the circle direction caused by the inversion press is related not only to the inversion press , but also to the inversion rate and temperature.