Based on meteorological sounding motion dynamics theory, "ringing about one hourflatfloating about four hoursfalling about one hour" three stages about six hours sounding system was designed. The movement trajectory of flatfloating was studied and analyzed. The station net was theoretically redesigned in accordance with the detectability of ground receiver to meet the requirements of World Meteorological Organization. Afterwareds, Changsha upperair station and two circumjacent site were selected to form an experimental network and to carry out the verification experiment of small area. Experiments show that the accuracy of the system rising is higher than the single operation sounding by balloon. The overall deviation of temperature is within ±20℃. The system falling can realize the time encryption of the original single balloon sounding, and could capture subtle weather changes by combining with the system rising. The system flatfloating can make up the lack of data of stratospheretroposphere continuous direct detection with long aging, which has a good prospect of application.