Abstract: The modeling of singular networked control systems was discussed, and the mathematic models were developed for the different driven modes of sensors, controllers and actuators especially whether the impulse exists in the system. Then, the causality, controllability and observability were analyzed for a class of singular networked control systems with short time delay, where the sensors were clock-controlled while the controllers and actuators were both event-driven. The necessary and sufficient conditions were given for the causality, controllability and observability of singular networked control systems.