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The paper analyzes the current situation of data transmission of the integrated avionic system in the field of general aviation and discusses the necessity to conduct ground on-line monitoring of data transmission of the integrated avionic system. Besides, the paper develops a data monitoring platform based on the embedded operating system according to the working principle of the avionic system and the R&D procedures of data monitoring. The hardware part of the monitoring platform is mounted on the ARM microprocessor, which realizes a series of functional modules like data collection, data processing, power management etc. The platform software is developed based on the embedded Android system, under the environment of which the software architecture of this monitoring platform is designed. Moreover, the paper has also developed the bottom driver layer, hardware abstraction layer (HAL), java native interface (JNI) and application programs of the test resources. Verified by several tested avionic systems, this monitoring platform runs stably and the systemic errors can be ignored, which satisfies the practical needs of data monitoring of the avionic system. As indicated by the engineering application results, this data monitoring platform for integrated avionic system has passed the ground test project certification of the Civil Aviation Administration and has been applied in practical production. 