The scientific experiment of near-space exploration is to obtain multi-scale, multi-level, and multi-type detection data by aerostats, UAVs, and other platforms, which supports the construction of near-space cognitive systems. In view of the complexity of near-space exploration, the diversity of detection data, and the great application value, the real-time visualized display of near-space detection data is conducive to the safe and stable development of near-space exploration. During the processing of data streams, the traditional synchronous-blocking I/O mode is difficult in constructing the driver architecture of asynchronous events and thus the data processing efficiency is low. For this reason, this study introduces the real-time analysis and display method of non-blocking mode for Constant-Bit-Rate (CBR) data of near-space exploration based on NodeJS+ElectronJS+EchartsJS. This event driven method is of asynchronous programming and can achieve real-time decoding of CBR data in the scientific experiment of near-space exploration, as well as efficient and accurate visualized display of the downward transmission data.