The aim of tbis paper is to demonstrate the method lo obtain the local frictional, accelerational and total pressure drops of refrigerant through capillary tubes combined with experiments. By this method, the distributions of the frictional, accelerational and total pressure drops along capillary tubes are effectcd. The analysis of the results showes that the distributions of the quality and pressure drops are non-linear. As a rcsult, scrious errors in the flow characteristics might appear if only the inlet, exit or the average value of the quality and the pressure drop is taken into account. The local value of the quality and the pressure drop must be considered in the calculation of the parameters for flow characteristics.