Analyses the reasons of coal-stagnating in the coal handling plant in the coal production process and gives some treatment methods,it's significant to treat coal-stagnating not only in coal production in mine but also in the electricity generating station and coal washery.

Comment is made in the paper on development status of coal preparation equipment of last 5 years and it briefly describes those newly developed innovational equipment and their development trend.

The paper puts forward a selection decision-making model of coal preparation equipment by fuzzy comprehensive evaluation, and explains why the method is advanced and reliable with specific examples.

Fault diagnosis technology and coal mine equipment repairment and management;

This paper introduces the main characteristics and basic function of Profibus-DP field highway, and its application in the system of coal mine equipment and supervisory control .

This article has conducted the research and the discussion to the coal mine equipment service management information system\'s establishment, it purposes realizing the computer management of the coal mine equipment service information, and the partake and intercourse of communication resources, it helps administrative personnels making the corresponding decision.