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In order to promote technology progress and innovative development of feed mixers and sustainable development of feed industry in China, carrying out mixing mechanism and innovative research of feed mixers is of great significance. In view of less research of mixing mechanism of feed mixers in China, the mechanism analysis and parameter optimization of the developed blade-type mixer were carried out. Through theoretical analysis and high-speed photograph research, the conclusion could be obtained that the material distribution zone could be divided into peristalsis zone, sliding zone and throwing zone according to the material movement in the blade-type mixer. And peristalsis zone was dominated by shear mixing, sliding zone was dominated by strong shear mixing, throwing zone was dominated by strong shear mixing and diffusion mixing along with weak convective mixing. And the position, size, shape of each zone were highly affected by the structure and operation parameters of the blade-type mixer. Under the condition of loading coefficient of 65%, which was determined by preliminary experiments, blade width, rotation speed and mixing time were used as experimental factors, variation coefficient was chosen as evaluation indicator, then experiments were done based on three factors five levels orthogonal rotation combination experimental method. Results showed that the descending order of effects of various factors on variation coefficient was rotation speed, mixing time and blade width. When blade width was 138mm, mixing time was 4.7min and rotation speed was 32.5r/min, the variation coefficient was 3.11%. The research results of the blade-type feed mixer could provide reference for the optimum design of feed mixers.