Abstract: Abstract: In order to reduce the inclusions in raw material and meet the sugar refinery requirements for the quality of raw material, based on the analysis of SL-1600 type whole stalk sugarcane harvester, the sugarcane mechanized harvesting system was revised depending its harvest procedure, such as the installation of cutting, detrashing, crushed leaves and docking. The new type of sugarcane mechanized harvesting system is 4ZL-1, which was optimized on the installation of cutting and leaf peeling, also increased the installation of crushed leaves and docking. According to experiments before (SL-1600) and after the improvement (4ZL-1), the qualification rate of cutting height increased by about 5.9 percent point, the broken head rate decreased by about 6.3 percent point, the qualification rate of stem increased by about 3.2 percent point, the qualification rate of docking increased by about 5.1 percent point, the total loss rate decreased by about 2.6 percent point , and un-detrashing rate increased by about 3.0 percent point . The results showed that the type of 4ZL-1 can reduce broken head rate, stubble loss rate, header loss rate, total loss rate, and can enhance the efficiency of detrashing and adapt to different heights of sugarcane.