Based on the 222Rn/220Rn and its progeny measuring instruments, the software of 222Rn/220Rn and its progeny measuring system has been developed by using MFC framework in VC++ developing environment. The monitoring software has many functions such as real-time monitoring and graphics processing, data query and statistical analysis, parameter setting and operation control, reports printing and exporting, etc. It was proved that the software could meet the requirement of 222Rn/220Rn and its progeny's continuous monitoring in measuring environment ...