Abstract: Abstract: With the expansion of fresh corn planting scale, the supporting agricultural machinery has not been developed correspondingly. At present, manual harvesting is still the main harvesting method in most areas, resulting in low harvesting efficiency and difficulty in meeting market demand. Aiming at that, a harvester adapted to the scale of fresh corn cultivation in China was designed in this research. Simultaneously, due to the special picking conditions of fresh corn, instead of the traditional ear picking roller or pulling stem plate picking platform, the ear breaking process of fresh corn from top to bottom was completed by oblique ear picking roller, so as to reduce the pressure on corn ear and separate ear from stem. Furthermore, through the method of special picking process, the 4YZT-2 type self-propelled fresh corn double ridges harvester was designed, which was mainly composed of ear picking platform, corn ear conveyer, hydraulic power device, diesel engine power system, travelling device and ear collecting box. Subsequently, field experiment were carried out in order to verify the reliability and practicability of harvester. The height of the picking platform, the speed of clamping and pulling stem belt, and picking roller gap were used as test factors to carry out the regression orthogonal test. The stem feeding success rate and the ear damage rate were taken as experimental evaluation index to test the machine performance. The results showed that the order of the factors affecting the stem feeding success rate was as follows: the speed of clamping and pulling stem belt, the height of the picking platform, and the picking roller gap; The order of the factors affecting the ear damage rate was as follows: the speed of clamping and pulling stem belt, the picking roller gap and the height of the picking platform. The analysis of variance and response surface was obtained using Design-Expert 8.0.6 to verify the correctness of the range analysis. Ultimately, the significance order in the range analysis was proved consistence with that from variance analysis. Moreover, the influence of each factor on the ear damage rate was extremely significant (P<0.01). The optimal parameters were 47.5 cm for the height of the picking platform, 525 r/min for the speed of clamping and pulling stem belt, and 29.5 mm for the picking roller gap. The stem feeding success rate was 81%, and the ear damage rate was 5.4%. The corresponding parameters were tested and verified in another field experiment, and the corresponding results of the two performance evaluation indices under optimized working parameters were obtained: with the stem feeding success rate of 83%, and the ear damage rate of 4.7%. The study provided a technical support for the mechanization of special corn harvesting, and its picking method also can be a reference for the development of other types of corn harvesters.