By cutting experiments and analysing the results for flat picks,cutting performances of the pick are studied.

The effect of several porameters on cutting performance are analysed on the basis of experiment results.

Installations and methods measuring rock two cutting performancd indexesd under laboratory are introduced in the paper ,their distinguishing features are analyzed,which can direct us to measure properly rock cutting performances.

Measuring method of cutting resistance of cutting teeth as well as its result analyzing;

Calculation and influence factor analysis on coal cutting force of pick;

According to the stress state influenced on the picks of cutting head on boom roadheader in different operation conditions, the matched relation between the oscillating force and cutting force of cutting head as well as its general value selection range are studied in order to provide theoretical basis of designing swing mechanism of boom roadheader.

This paper expounds merts and demerts of coal plough,through researching installed power and cutting depth,cutting force and web of coal plough,points that apply fixed quantity push-off system to control cutting depth for increase in ability of coal planer cutting anthracite.