The telemetry channel is a typical time-varying and fading channel. For the purpose of compensating the information quality in the receiver，the method of error-coding is more significant than increasing system power. Based on the theory of RS code and the characteristics of the telemetry channel，the concatenated code scheme of RS code and convolution code was put forward. The scheme was simulated and its hardware was designed. The result shows that the gain of the concatenated code is larger than that of the convolution code by 2 dB.