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Radar is transliterated into Lei Da in Chinese,which is the abbreviation of radio detection and ranging.It is an electronic device for detecting targets,by sending out pulses of electromagnetic waves,which is also went by the name of “a sleuth of the air” in modern wars.Just as many other technologies,the invention and development of radar is mainly caused by the need of wars.This paper firstly introduces the rationale and composition of radar and then it introduces the enlightenment by bionics in manufacturing radar.Thirdly,the paper analyzes the subjective and objective reasons of the invention of radar in World War Two,focusing on the process of the invention and development of radar which is followed by the introduction of the current research.Finally,it gives an audacious prediction about the trend of applying radar in future wars which might be used for the reference of late-model wars in the condition of informationization.