Taking the double swept flying wing as a base outline in consideration of stealth performance, a wingtip is reshaped. The numerical simulation method is utilized for studying the influence of wingtip shape on the longitudinal aerodynamic characteristics and longitudinal stability of double swept flying wing. The result shows that for the double swept flying wing, the sheared wingtip can provide forward thrust, reduce the drag, increase the maximum lifttodrag ratio, and enhance the longitudinal static stability. Different shapes of sheared wingtip have different effects. Under condition of flying at a cruising speed, compared with the basic wingtip, the best sheared wingtip can reduce the drag by 7.9%, increase the maximum lifttodrag ratio by 11.9% and increase the static stability margin by 10.8%. The results of the article can provide certain references for the selection of the wingtip shape of the double swept flying wing.