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In view of the lack of suitable machinery for pea harvesting in China, in order to realize the mechanized harvesting of pea crops, the 4SZ-1.2 pea windrower was designed. Firstly, the current situation of China’s pea planting system and pea harvesting technical requirements were thoroughly understood, and the problems such as cutting difficulties, transportation blockage, lay blockage that are easy to occur in the process of mechanical harvesting were comprehensively analyzed. The designed 4SZ-1.2 pea windrower was mainly composed of the cutting device, the anti-winding reeling device and the conveying and laying device, which can effectively realize the cutting, conveying and laying operations of pea crops;then the quadratic regression orthogonal rotation test was used to analyze and determine the optimal parameter combination: the forward speed was 1.03m/s, the cutting speed was 1.19m/s, the conveying speed was 1.22m/s, and the reel rotation speed was 45.97r/min. Finally, the field tests of pea windrower were carried out in Pinggu, Beijing, and the field results showed that the pea placement after the pea windrower was laid neatly, the stubble was cut uniformly. After data sorting, the following data results can be obtained：the missed cut rate was 4.78%, the harvest loss rate was 4.96%, and the operation efficiency was 0.185hm2/h, which met the demand for peas harvesting. The overall structure of the pea windrower was simple and the cost was low. It was hoped that the research result can provide technical support for the application of pea harvesting machinery.