A lateral guidance method applied on a large landing inclination angle condition enables the influence of a large landing inclination angle on the lateral guidance instructions to be reduced and the strike precision to be improved effectively, reasonably distributes and plans the lateral guidance instructions, avoids the larger tail-segment guidance amount, solves the lateral guidance instruction calculation problem of an aircraft on the large landing inclination angle condition, and satisfies the demands at the aspects, such as the large landing inclination angle condition, the lateral guidance precision, etc.