Abstract: A multifunctional and modular space radiation hazard monitor is designed based on the characteristics of the space radiation environment and the related radiation effects. Different types of modularized monitors are designed for different orbits. There are monitors capable of detecting the single event effects, the total radiation dose effects, the displacement damage effects, and the surface and deep dielectric charging effects. The prototype for the space radiation hazard monitoring is an integrated, low-power instrument that provides the host spacecraft with in-flight radiation data, in-situ diagnosis and autonomously generated warnings of the space radiation environmental threats.