A new design scheme is proposed to resolve integration problem of humidity sensor and RFID tag.The humidity sensor is connected to the RFID tag antennas to form a parallel structure

and there is a logic switch on the line between humidity sensor and RFID tag chip.In this design

some of the functions of sensor are transferred to the RFID reader so that some components of the sensor can be cut

reducing the production costs of existing scheme.By defining the signal strength with the logic switch off as a reference value

the problem of setting a standard is solved in humidity detecting process.RF module can be used to make the energy coupling transformation without requiring the entire design scheme to have an continuous external power source to provide energy.In addition

related datas obtained by experiment proves the feasibility of this design.