Abstract: The application of vacuum technology to technics of electric assemble mainly includes vacuum encapsulation,vacuum impregnating and vacuum coating.The Insulation performance of products has been truly enhanced by vacuum encapsulation which switched gas isolation to solid isolation。The products has been entirely covered by insulated varnish after vacuum impregnating technic,and the insulation intensity and resist press capability of products has been enhanced.Products has been filmed uniformly by vapor deposition through vacuum coating technic and has high insulation intensity.Through application of vacuum technology to technics of electric assemble,insulating technics of space electronic products has been improved and provided high reliability and security guarantee for space electronic products.