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Combining computer technology with traditional Chinese medical treatment mechanisms, the paper deals with a new approach to the design of medical sensor, designs the main circuit of an EMG sensor by evolution. A framework of evolvable sensor is proposed based on the combining of the characteristics of conventional sensor and evolvable hardware. Integrated with the hierarchical coding characteristic of GA and analog/digital circuit, hierarchical structures evolve method which suits the evolvement of analog sensor circuit is proposed. In the present case study low pass filter circuits are evolved successfully in the usage of an improved elitist preserving and adaptive GA through off-line evolution, whatpsilas more, simulated by OrCAD/Pspice. The preliminary experiments and results attempt the meaningful explore to the entire design of the evolvable sensor and the transform from EHW theory based on analog circuit to practical application.