To achieve a11 edge-preserving noise reduction for mixed Iioise, several filters that employ a fuzzy controller have been proposed. The optimization method of paameters in the fuzzy controller is one of the problem for these filters that have cascade connected or layered connected fuzzy controllers. Tn this paper, the tuning method of pa.ra.meters in these t,ypes of the fuzzy controller is developed and is applied to the edge-preserving noise reduction fuzzy filter proposed by Takashima et al. Then a new edge-preserving noise reduction filter whose parameters can be optimized by learning is obtained. Simulation result shows the resulting filter can sufficiently improve the noise reduction performance of the original filter.