The main standards and norms used in developing the on-line monitoring system for cogeneration units in shandong province as well as the composition and features of system structure

hardware

and software have been presented.In aspect of hardware

the system construction and features of thermoelectric data aquisition terminal LN 2000-RTU have been described

and the use of remote I/O in ordinary twisted-pair for LN 2000-RTU

and three acquisition methods of dedicated acquisition unit for cogeneration being put forward.In aspect of software

two calculation methods using the dynamic model

namely deducing method and inverse-deducing method

have been described

and the advantages and inadequacies of them being compared.For calculation of boiler efficiency using inverse-deducing method through thermodynamic model

the occurred error has been analysed in great detail

and two fitting formulae for calculating boiler efficiency by using the least square method being presented.