To resolve the problem of the quantization assessment of telemetry data relying on qualitative analysis of expert knowledge, the highly arbitrary artificial participation in subjective assessment, providing solutions in a short time in multi-station environment, this paper proposes a method of telemetry data quality dimensions within context on the basis of information entropy. In multiple-source environment, the method constructs and evaluates the reference standard by test information, measures the accuracy and completeness of data by the information entropy index, and the simulation flight test data of the certain aircraft are used for test analysis. The simulation test shows that the method of the automatic quantization assessment not only evaluates the accuracy and completeness dimension of telemetry data accurately, but also has good adaptability and easy to implement.