Sensor is to convert non-electric quantity of a component, has a significant role in industry and technology, its main function is to use non-power into electricity, and through the power of transformation to detect the size of captured non-electric. In many of the sensors, capacitive sensors because of their small size, good temperature stability, dynamic response, simple structure, high resolution and strengths, is widely used in industry, agriculture, national defense and other fields. Capacitive sensors can also be used in physics experiments to detect the size, temperature, speed, speed, and concentration of a substance. Capacitance sensor application in physics experiments that many physical quantities is properly detected, and to simplify the many experiments. Research and development of capacitive sensors application in physics experiments are extremely important, mainly the principle of capacitive sensors is analyzed, and variable area type capacitance sensor application in the experiment of measuring metal linear expansion coefficient were discussed. Introduction of metal linear expansion coefficient of capacities sensor measuring experiment, derivation and operation experiment went a lot less cumbersome. Experiments became more clear and simple, and also reduces the tedious process of the error, and more timely response of metal the length varies with the metal temperature of the process. Confirmed the importance of capacities sensors in physics experiments.

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