Abstract: In order to solve the problem of early warning and detection for near space hyper aircraft with plasma sheath, this paper analyses the present research status of the near space hyper aircraft from several aspects, such as the track characteristic, the distribution of the plasma sheath and the analysis of the measured data. On the basis of the above results, the solutions of the problem of early warning and detection for near space hyper aircraft is analyzed, such as the target detection method for plasma sheath, distribution and dynamic characteristics of plasma sheath and the propagation characteristics of electromagnetic wave in plasma sheath. The results can provide a reference for the design of the radar detection system for near space hyper aircraft.