In order to overcome the difficulties from strict supervision and other issues of radon standard source in the field calibration of the emanometers,we conducted field calibration experiments of the seismic emanometers with the exempt miniature radon chamber,which is developed by East China University of Science and Technology,and analyzed the feasibility in periodic calibration. In this work,comparative calibration experiments of two emanometers in the network with miniature radon chamber and standard radon chamber were carried out in accordance to JJ825-2013 verification regulation of radon measuring instrument. The results showed that our new method for calibrating the seismic emanometers was basically feasible. The miniature radon chamber adopts exempt radon source and automatic radon concentration control system,and has the characters of convenient operation and transportation that can be used as a regular calibration device in seismic stations to promote the unification of radon observation values of seismic systems.