Abstract: Mesh roller-type cotton and film remnant separator unites mesh rollers and force of wind to separate the film remnant. Studying of material properties of cotton and film remnant is of great importance for further study on the principle of separator. Using the theoretical analysis and the experimental research method, following results could be obtained: 1) relationship between cotton shape and suspension velocity; 2) critical equation between cotton shape and adsorption characteristic of mesh roller-type; 3) relationship between suspension velocity and remnant film area; 4) relationship between wind velocity and wind pressure on the two sides of film remnant. The results could provide theoretical foundation for further research.