Abstract:Navigation unit is the guarantee that Airdrop system can deliver supplies to the designed place accurately and implement landing safely. On the basis of relevant foreign navigation scheme and dropping requirements for the special conditions, We proposed the scheme that combine IMU/GPS and Laser distance meter for the airdrop system., Kalman filtering technique was used to obtain High-precision speed and position information, and simulation results are proved to meet the requirements of precision airdrop to the navigation.