Abstract: To improve the conductivity of silver paste used on solar cell and reduce the dosage of silver powders,screen printing method was accepted in this paper,and the influence of silver powders’ morphology,concentration and grading on the silver paste’ s performance were studied,and the conductivity mechanism of silver film was discussed. The was found that: when flake silver powders’ content was 80%,square resistance reduce from 15. 65 mΩ/□ by spherical silver powders to 7. 41 mΩ/□; As the conductive phase when the content of mixed silver powder’grading was 73%,square resistance of silver film reduce to 6. 59mΩ/□,the conductive properties of the silver film was improved effectively. This is because the line contact or surface contact state is shown after flake silver powder sintering,and changed the conductive mode of point contact of spherical silver powders,so it can effectively decrease the volume resistivity of the silver film.