Abstract: The self-developed “pipeline and geological body integration” anchored multi-point displacement meter was used to carry out real-time and continuous monitor of the displacement of the rock stratum with different depths of the roof of the buried oil and gas pipeline. The laws of pipeline displacement and stress variation under the influence of underground mined out zone were analyzed based on the three-dimensional computational model of “pipeline-geological body integration”. The following conclusions were as follows: the failure and instability of stiff roof showed a certain spatiotemporal difference, and layer separation was also obvious; in time, the failure of rock mass experienced a process of “stability, imbalance and re-stabilization”; in the axial direction of pipeline, the collapse shape of the surface formed under the influence of the underground mined out zone was “concave–basin”, the maximum subsidence was located at the center of the underground mined out zone; in the direction of strike, the coupling effect of the mountain tendency pressure and the vertical settlement of the underground mined out zone made the displacement of the two sides appear a dumbbell shape distribution; moreover, the maximum value of horizontal movement was not located in the center of the underground mined out zone, but inclined to the mountain.