In order to detect and track dim-point targets under the complex background of sky, a high speed method is put, which uses multiwindow, little yardstick, repetitious subtracting and fusing images.

The sealing technique of FED is introduced in this papers, which include the selection, mixing and painting of low fusing point glass, the process of heating and pre-process of the flat glass.

Fuse is with melting point inferior material is made, electric current became big can calorific fusing, have insurance effect.