Survivability of data link is a critical factor in improving systematic capability of military under the complex battlefield environment. In this paper, the improving of electronic defense ability is discussed and analyzed to maximize combat effectiveness based on the study of joint mission requirements. Besides, the electronic technologies, such as anti-jamming waveform, interference suppression, signal enhancement, new concept technology, and networked collaborative way, such as distributed no-center network and intelligent self-organizing network, are emphatically studied and introduced.