Abstract: The workload of forestry production with four typical kinds of work in Great Xinan Mountain Areas of China was investigated by means of the principle of working physiology with a new technique of heart rate measurement. According to the Naticnal Standand GB 935-89, the working strength with four kinds of work, i. e. site preperation in Autumn, manual prepile, transmission light tlinnuing, and afforestation, was graded, The reasonable suggestions concerning arrangement of working time, work quotas,and increase production have been made.

Key words: Forestry working science, Heart late, Workload, Ergonomics