The most important form of loss of energy in long-distance gas pipelines was turbulence resistance. In order to study the V-shaped riblet influence on the resistance in the gas pipeline, this paper used the software of CFD to simulate two different geometric size of V-shaped riblets and smooth pipe. The Reynolds number was 74 880. By analyzing the flow field in the pipeline, the distribution of vorticity and wall shear stress, the reasons for increasing drag and decreasing resistance were found. Based on this, the drag reduction mechanism was obtained. The results showed that：compared with the smooth gas transmission pipeline，when the riblet size in the pipeline was s ⁺=22, the flow velocity, vorticity value, the area of wall shear stress and the shear stress were small. Riblet had the effect of drag reduction. When the riblet size of the pipeline was s ⁺=44, the flow velocity of the near wall area, the vorticity value at the top of the riblet, the wall shear stress increased area and the shear stress value was large. Riblet had the effect of increasing resistance.