In this essay, the radar detection range and anti-air missile horizontal kill zone in fleet coordinate air defense were studied. The radar detection range model under active blanket jamming, passive jamming and distributed jamming was analyzed. The far boundary of anti-air missile kill zone calculation algorithm was also given. Then the overlapped radar detection area, horizontal kill zone in fleet coordinate air defense and spacing length of ships under jamming were simulated. Results show that when jammed, the radar detection area reduces by 30%; ship-to-air missile kill zone area reduces almost by 75%. If targets are planes with subsonic speed, the distance between formations should be 16 kilometers.