Abstract: The maize hybird BiDan-4 was breeded by the institute agracutual on Bijie in 1982. It aimed at the natural character of ecology on the North-West Mountain area of GuiZhou and the maize productivity.This hybird used the self 405 as female,it was selected from Mexican White Maize resource; the self 411 as male, it was selected from a natural hybird of another self 330.BiDan-4 was high yield ;high quality; good resistance; high applicability.It was passed the examine and approve by the Crop Breed Censorship of GuiZhou on 1992. Now it was popularized and applied , great area planting the hybird.