In midcourse guidance of missile by cooperation of different kinds of aircrafts， abnormal abrupt change of missile overload is easily emerged in the process of guidance handover， which is mainly resulted from the switching of target information and guidance law.Based on the idea of converting the “abrupt change” to a “gradual change”， thus reducing the variable extent of overload， algorithms for the handover laws of target information and guidance law are proposed by adopting the variable weight coefficient method.Of which， the handover law of target information gives the “virtual target” information after weighting on the target information from handover aircrafts， while the handover law of guidance law gives the weighted guidance law of that before and after handover.Both the handover laws gradually change the weight coefficients of two weighted terms， until one weight coefficient is 0， and the other is 1， thus to realize the switching between weighted terms.To ensure the smooth transform of missile overload in the handover phase， it should be satisfied that the derivative of missile acceleration exists in the handover phase.Finally， simulations are carried out to demonstrate the effectiveness of the proposed handover method.