Abstract: The flotation behavior and interaction mechanism of DJL-1 and DJL-2 with bauxite in the process of flotation were studied by single mineral flotation test, measuring the contact angle, infrared spectroscopy, zeta potential.Diaspore has larger contact angle and stronger hydrophobicity after contact with DJL-1 or DJL-2.The contact angle of kaolinite is almost unchanged after contact with DJL-1.However, it is larger after contact with DJL-2.DJL-1 increases the surface Zeta potential of diaspore and kaolinite negatively.DJL-2 has little influence on the surface Zeta potential of diaspore and kaolinite.The maximum difference of recovery rate of diaspore and kaolinite was 54.5% and 70.5%, when using DJL-1 and DJL-2 respectively.DJL-2 obtained better flotation results at wider temperature and pH range.The action between diaspora and DJL-1, DJL-2 is chemical adsorption mainly and go with hydrogen bond in part.There are hydrogen bonds between DJL-1 and kaolinite surface.The results show both DJL-1 and DJL-2 are excellent collectors for positive flotation of bauxite and DJL-2 is better.