This paper introduces the theory of the circuit configuration of resistance strain sensor for tension measuring.It focuses on the problems we have to face in small tension measuring,as drifting over time,drifting over temperature,noise.And gives some solutions about machine learning,digital filtering area. This design develop an instrument for measuring small tension based on SPCE061A microcontroller and tension transducer.The model of the sensor is developed by using least square regression method.The temp...