By using several analytic techniques such as physical chemistry analysis、 infrared spectrum analysis and optical spectrum analysis

the synthesis diagnosis of the equipment’s lubricating oil is carried out.An expert system of lubricating oil monitor is developed based on the analytic techniques.The framework of the expert system is put for ward

the way of knowledge expression according to the character of the expert system is determined the knowledge-bese of the expert is established based on database SQL Server 2000 and the structure of the reasoning machine with forward and backward union is determined.By using the expert system

the running status of the machine can be judged

the oil changing periods can be duided

and the enterprise benefit is improved through predicting the potential accidents promptly to guard against the disastrous damage.