Distribution flow pipeline used in cylindrical chemical laser is composed of an annular general pipeline and a limited quantity of branch pipelines that are connected with the inner or outer circular arc of general pipeline. Its structure and flow field characteristics differ from those of linear distribution flow pipeline used in conventional chemical laser. Flow field characteristics of above-mentioned three kinds of distribution flow pipelines were analyzed contrastively based on three-dimension computational fluid dynamics methods. The numerical simulation results demonstrate that total pressure of general pipeline in linear distribution flow pipeline is higher than that in outer-circular-arc annular pipeline, but lower than that in inner-circular-arc annular pipeline. Both distribution flows of branch pipelines and secondary flows produced in annular general pipeline can excite radial velocity on the section plane of general pipeline. These phenomena enable the gas flow of general pipeline to have remarkable three-dimension characteristics. Mass flow rates of branch pipeline outlets are higher and higher along the direction of main gas flow movement. Its trend is contrary to upward tendency of total pressure in general pipeline, but is similar to downward tendency of static pressure in general pipeline. By comparison, Mass flow rate fluctuating amplitude of branch pipeline outlets in outer-circular-arc annular distribution flow pipeline is smaller than that in linear distribution flow pipeline, and the amplitude in inner-circular-arc annular distribution flow pipeline is the biggest of the three. As a result, outer-circular-arc annular distribution flow pipeline is of advantage among the three methods in distributing uniformly gas flow, while inner-circular-arc annular pipeline is the lowest and the linear distribution flow pipeline goes between the other two.