The issue of the measurement of a gas-liquid medium by the mass component-by-component fl ow rate is examined. A thermal method is proposed for measurement of the component-by-component fl ow rate of a gas-liquid medium that is fl owing past on the channel, with uniformly distributed cross-sectional heat energy. Components of the medium with different heat capacity receive pulsed thermal charges different in value, recorded by heat fl ow sensors. The type and amount of the components is determined from the ab-sorbed heat energy. Complex equipment is not required to implement this thermal method. Heat capacities are measured with minimum distortions of the transmission of heat fl ow by means of the newest sensors of a gradient type, with a small time constant and high sensitivity.Keywords: multi-component, fl ow meter, heat fl ow sensors, gas-liquid medium, fl ow, mass, heat capacity.