[en] To meet the needs for evaluation of 3D dose rate field by the operation departments and the design departments at nuclear power plants, three key technical issues concerning calculation, display and dose optimization of 3D dose rate filed were identified and solved with the development of software system RPOS. The RPOS system has been established and tested using the measured dose rate data in controlled zone at nuclear power plant. The results indicated that the RPOS system could be used for accurate simulation and virtual display of 3D dose rate field, as well as dose optimization of the worker at nuclear power plant. Further testing and improvements of the RPOS will be continued. (authors)