In this paper, we discuss the state feedback control of fully and partially observable fuzzy discrete event systems. Firstly, the definition of observable fuzzy predicate is given, and we construct a reasonable controller for a specified target fuzzy predicate such that the reachable fuzzy predicate of the closed-loop system equals to the specified fuzzy predicates if and only if the fuzzy predicate is controllable and observable. Secondly, under certain conditions, we transform a partially observable fuzzy discrete event system into a fully observable fuzzy discrete event system, and discuss the control invariance and controllability of fuzzy predicates of two types of systems.
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