Surface tillage technology could weed and eliminate the soil harden and wheel ruts, but it is difficult to avoid straw blocking for current surface tillage machine. In order to achieve surface tillage and weeding with a large number of straw mulching and decrease soil disturbance under the requirements of conservation tillage, a doublevane symmetrical rotary blade with the functions of chopping and sliding cutting was designed. Edge curve and structural parameters of this surface tillage blade were determined by theoretical analysis, and the results from finite element static analysis and modal analysis by using SolidWorks software and Abaqus software, which indicated that the blades structure could meet the requirements of strength and it won’t occur resonance phenomenon. The field comparison experiments among surface tillage blade, rotary blade and topsoil shovel were conducted after corn harvest, and the results showed that the crumbling and weeding ability of doublevane symmetrical rotary blade had an advantage over topsoil shovel and the surface roughness and residue cover rate after working were also better than those of rotary blade. Therefore, the soilcrushing rate of doublevane symmetrical rotary blade was 92.2%, surface roughness was 0.6cm, weeding rate was 97.3% and residue cover rate after surface tillage was 39.5% on the condition of all remaining on the field, thus this doublevane symmetrical rotary blade could meet the operation requirements of surface tillage under conservation tillage.