We comprehensively analyze the characteristics of the sensor in dam safety monitoring system. In the combination of the development of new type of sensor system of microseismic monitoring etc. and the analysis of the system information flow, the fundamental principle of expansion realization of information sources under 5 patterns of sensor, simulation signal, digital trans-ducer, digital signal and database is revealed. The characteristics of the above-mentioned information sources expansion are an-alyzed through practical case and E-R graph and the solution of integrating the microseismic monitoring into dam safety monito-ring via database is put forward.%综合分析了大坝安全监测系统传感器特点，结合微震监测等新型传感器系统的发展，通过分析系统的信息流，揭示了在传感器、模拟信号、数据转换器、数字信号及数据库等5种形态下实现信息源拓展的基本原理。通过实例以及E-R图分析上述信息源拓展的特征，并给出了将微震监测通过数据库统一到大坝安全监测系统的方案。
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