Based on the Exergy Energy Level(EEL) in the process of work energy conversion about the Cogeneration Combined heat&cool and Power(CHP)and the Heating/Generating/ Cooling /Parted/Generation(HGCPG),and combined reasonably with the time infected factor of its founds(initial and operation expenses), a new method Exergy Energy Level Value Factor Method (EELVFM) ,which is more scientific for judging the energy conservation of the system , is put forward. The example is given. And the results show that the EELVFM, which can be used to judge the economical in CHP before operation, is a comprehensive thermodynamics and economics index.