In order to obtain the horizontal restriction of any two aircraft, a method of the assignment problem (AP) of flight level is presented.

Combined with the GJB and the characteristic of the environment control system of airplane, the ventilation and cooling condition of airborne electronic equipments in factual use environment was investigated;Combined with the life profile, task profile and its environment condition, flight altitude, flight mach number, etc, the stress in reliability test and the problems in those standards in.

A new structure of integrated optical flying head (OFH), with both perfect mechanical and optical performance, is designed, which can achieve stable flying height and high signal/noise ratio optical signal during the read/write motion in near field recording (NFR) system.

A dual wavelength multistep method for measuring flying height is constructed.

A calculation method of bumping ground probability of the flight is presented and at the same time the calculation example of bumping ground probability in relation to flight height is also given in the paper.

In the 1∶1 000 000 high precision aeromagnetic reconnaissance performed in central and western Qinghai Tibet plateau, the acquirement of high quality surveying result depends largely on keeping relatively low flying altitude in field work.