Abstract: In order to removal maize stubble for subsequent standard procedure, , a tillage machine for high-powered tractor was designed with functions of cracking stubble, rotary tillage, deep digging, ridge forming and shaping ridge simultaneously combined with technology of conservation agriculture in northward. The structure of self-driven curved tooth mechanism and the rotary cultivator were completed for better cultivating effects with field experiment. The win blades shovel is universal type, and the depth of sub soiling is above 30 cm. Motion parameters of the self-driven combined tilling machine were optimized by several times of experiment. Rotational speed of cracker and rotavator was 33-37 r/min and 350-390 r/min, respectively. Field experiment showed that its performance can perfectly meet agriculture technique requirements. Compared with classical harrow and import combined tilling machine, this tractor increased ground-breaking rate by 2.4%-6.9%, increased cutting stubbles rate 6.3%-12.9%, and saved fuel consumption 26.3%-40.4%.