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In order to improve the screening effect of fresh tea leaves, an equant-diameter roller screening machine was developed with adjustable structural and technical parameters. The main parameters of roller rotating speed, roller diameter and roller length were calculated, and the model selection of driving motor was done. The optimal parameters combination of roller inclination, rotating speed and feeding rate was made based on the orthogonal test. The treatments were arranged according to orthogonal table L 25 (5 6 ), and the influence of each parameter on screening rate was analyzed. The results showed that the sequence of each parameter’s influence on total screening rate was roller inclination, 〖JP3〗feeding rate and rotating speed, and screening rate reached the maximum when roller inclination was 6°, feeding rate was 1.5 kg/min and rotation rate was 16 r/min. To double the screening productivity, feeding rate should be selected as 3.0 kg/min, while correspondingly total screening rate was dropped by only 3.3% averagely.