An intercomparison of radiosondes was held in Mauritius in February 2005. Manufactures from Finland, Japan, USA, France, UK, Germany, and Switzerland brought their products. It is in fact an international intercomparison of high-accuracy and high-technological sounding systems. These sounding systems adopt GPS wind-finding technology and have the features of slight volume, light weight, automatic signal-receiving and data-processing, and narrow communication channel. The sensors of these systems have distinctly small volume and high responding speed. In general, the technological features embody the development of global sounding technology. Analysis and introduction are made of the technological structures and functions of these sounding system.