This paper proposed a control method for ecoplanter machine, which used the resistance that the drilling bit encountered when drilling downward and the natural frequency of pitdigging link structure to control the movement path of the drilling bit. First, an approximate method was employed to compute the resistance that the drilling bit encountered when drilling downward, and the resistance formula of branching pointed to the earth was obtained. Then, the natural frequency of elastic pitdigging link structure in the common circumstance was inferred, and the computational programme of controlling drilling point path by only changing the regulation speed of oil cylinder with other invariable condition was presented. The analysis shows: (1) that the pit shape becomes small when increasing the regulation (downward) speed; (2)that the pitdigging speed of drilling bit increases when increasing the regulation speed; (3) that using the movement control of mechanism to carry on the geometry control of the pit shape can enhance the movement characteristic and structure characteristic of the mechanism.