Abstract:According to the structural parameters of GJ-85 chain saw made domestically, a series of imitating tests have were been made by using dual regression orthogonality test on the test table. The relationships between cutting power, cutting productivity, the consumed energy per unit-area and cutting speed of chain, cutting force and cutting length have were been obtained by analysing and treating the measured data, according which, the best match parameters have were been found out. The theoretical basis of improvement and the conditions of reseanable application have were been put forward to the GJ-85 chain saw by analysing and calculating.