Abstract: Considering the characteristic of mass plus made at the entrance transmitting along the whole pipeline, simulating gas flow field in the pipeline with partial blockages can be done by using TVD/Godunov hybrid schemes as well as time-splitting algorithm.The hyperbolic conservation laws is nonlinear and can be Solved by second order accuracy TVD schemes.This schemes can capture the shock in high accuracy without oScillation much better than the ordinary methods.By dynamic monitoring the pressure at the entrance of the pipeline and real-time analysis of pressure curve at the entrance, the blockage position, the plug length and intensity can be calculated and the deviation is 2.15%, 0.842%and 2.43%compared with actual values.