Energy efficiency detection system plays a important role in energy conservation service market, which is applied in lots of enterprises. Mobile detection system can save manpower and financial resources especially for energy conservation service agencies and energy efficiency assessment institutions, which consists of the portable devices, self-organizing communication network, reliable data collection ability, strong data analysis and display tools. The physical architecture, function architecture of the system was designed and key technologies about the system were also specially studied. The test method about the system was designed, which is used to guide the technicians in the field. The thesis results supply a practical measure for the work of the above mentioned related agencies and institutions.