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The structure and working principle of two-ridges and four-lines semi-feeding self-propelled peanut type-4HBL-4 combine harvester was introduced. It could completely harvest two-ridges and four-lines peanuts in one time and accomplish digging, excavation to soil, transportation, picking, separation, cleaning, collection boxes and other operations. The suspension type with square institution which had better ground-profiling effect was adopted. Collecting-fruit equipment was used to clean twice. Throughout the test in the field, it met the requirements of design and relevant standards with the picking rate of 98.9%, the total loss rate of 3.3%, breakage rate of 0.2%, impurity rate of 3.1%, and net operating-hour productive efficiency of 0.16 hm2/h, which met the design requirements and related standards.