The article is dedicated to analysis of effects of gas communication constructions on pulsation amplitude which originates from periodic work of gas-motor compressors. The objects of research are the types of gas-motor compressors MKS12/(75-85)-(85-180) and 10GKNAM1/(50-53)-(70-125)/90-(125-150). A design technique and construction of diagram of gas entrance to buffer capacity of a compressor, which allows the estimation the dynamic processes in gas brace was given. The method is based on the design of a quantity of a gas portion entering the buffer capacity in equal interval of time. Due to the built diagrams the analysis of dynamics of gas movement in buffer capacity and gas pipelines is carried out. This technique is recommended to be used at a choice of the compressor equipment for concrete pressure regimes and productivity. The analysis of influence of a design of gas-motor compressor’s buffer capacity on amplitude of pulsations was carried out. Keywords: gas-motor-compressor, amplitude of pulsation, the piston compressor, the buffer capacity, compressor cylinder, design method.