The real-time telemetry data processing system has realized the real-time origin data connecting based on design idea of post-mission data connecting. The real-time connected data processing has the speed of real-time data processing and the quality of post-mission data processing, and offers the whole course result, and can resolve parameters wrongly due to scattered data, so it can better satisfy the task demands. Owing to the real-time data connecting method which is brilliant and difficult in the real-time processing, the paper puts forward and carries out the real-time telemetry original data connecting method for many devices, and analyzes the realistic problems and difficult in the connecting course, and offers the key steps, core algorithm and the concrete flow of the method, and points out the difference and difficulty with the post-mission data connecting method. At last, its application effect has been compared with the post-mission connected data result and single device data result, and compared results show the relia-bility, efficiency and robustness of the real-time telemetry original data connecting method, which has been used in data processing in many tasks and has received perfect effect.