This paper deals with the experimental study of measurement of capillary blood flow by means of heat dissipation. Botter safty can be reached by using this method becauce no harm will be done to the skin as measurement is conducted. Measuring principle is at first introduced, together with the system design. Then the probe configuration and sensors are presented. More attention is paid to discussions of error amplifier, circuit of temperature-scale linearization, and selection of corresponding circuit param...