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【正文】 erval. Its reasons lied in that straws would be cut down pletely while the small interval between the fixed and moved blade, the bigger interval between the fixed and moved blade or near diameter of corn straws, corn straws could be embedded into sawtooth and participated in cutting again, so feeding quantities of straws were increased. And straws could not be cut down pletely which brought to rearing phenomenon. The cutting rate of 68 , Transactions of the CSAE straws decreased with increasing of velocity of vehicle when the interval between the fixed and moved blade was determined, and cutting rate of straws with interval 5 mm between the fixed and moved blade was bigger than that with the interval 10 mm and nofixed blade, its reasons lied in the probability of entering throwing area for straws not being cut down pletely decreased while small interval between the fixed and moved blade. 5 Conclusions 1) A new type of sawing antiblocking mechanism, which could get rid of some shorting that mon smooth blade is difficult to seize straws as well as high rotation speed, was designed according to the antiblocking requirements of notillage planter and need in practice. The sawing antiblocking mechanism had strong capability to seize straws and lower rotation (650 r/min) speed and lower consumption (power consumption per unit width up to kW/m) and higher cutting rate of straws, a new approach was provided for design and development of the antiblocking mechanism of notillage planter. 2) The stress distribution of the sawtooth blade was calculated by the ANASYS finity element software. The results showed that its intension would be difficult to be destroyed and the sawtooth blade was feasible to cut corn straws. 3) The sawing antiblocking mechanism realized an integrated function of directly throwing and cutting straws by counterclockwise. The straws could be cut down pletely by two cutting modes of sustaining and nosustaining cut. Meanwhile, the straws being cut down pletely could be directly thrown to the rear of opener by the former tooth horn of sawtooth blade and throwing ban device. 4) Experimental results showed in the soil bin device that: (1) Cutting rate of straws increased with increasing of rotation speed of sawtooth blade and moisture of straws, and higher moisture of straws would be of benefit to improve cutting quality。 (2) Power consumption increases along with increasing of rotation speed, and that decreased with increasing of moisture of straws。 ( 3 ) Cutting rate of straws decreased with increasing of velocity of the vehicle while interval between the fixed and moved blade had been determined, and to decrease the interval between the fixed and moved blade would be of benefit to improve cutting quality of straws without phenomena of rearing out and leaky cut, and could decrease power consumption. Compared with the other driving antiblocking mechanism, the theoretical analysis and experimental results showed that the sawing antiblocking mechanism had better capability to cut and lower rotate speed and power consumption as well as stronger suitability for different stubbles mulch. [References] [1] Zhang Jinguo, Gao Huanwen. Study on the strip chopping antiblocking mechanism[J]. Transactions of the Chinese Society of Agricultural Machinery, 2021,31(4):33～ 35(in Chinese). [2] Luan Yuzhen, Tian Hongwei. Research on performance and matched pattern of chopper for cornstalk and root[J]. Transactions of Jilin Agriculture University,1991,13(3): 65～ 68(in Chinese). [3] Mao Hanping, Chen Cuiying. Research status of the straw chopper[J]. Transactions of the Chinese Society of Agricultural Machinery, 1996, 12 ( 2 ): 152～ 154 (in Chinese). [4] Mao Hanping, Chen Cuiying. Analysis of working mechanism and parameters of the straw chopper [J]. Transactions of the CSAE, 1995, 11 (4): 62～ 66 (in Chinese). [5] Wu Fengsheng, Jin Mei. Design of 4Q— 31 chopper mechanism for rice and wheat stalk[J]. Transactions of the CSAE,1998,14(3):248～ 250(in Chinese). [6] Wu Ziyue, Gao Huanwen, Zhang Jinguo. Study on 69 Liao Qingxi et al: Design of antiblocking mechanism for notillage planter cutting velocity and power requirement in a maize stalk chopping process[J]. Transactions of the Chinese Society of Agricultural Machinery, 2021, 32 (2