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To investigate the SEDs of galaxies considering the dust extinction processes in thegalactic disks, we present the population synthesis models for normal galaxies withdusty disks. We use PEGASE (Fioc & Rocca-Volmerange 1997) to model them withstandard input parameters for stars and new dust parameters. We nd that the modelresults are strongly dependent on the dust parameters as well as other parameters (e.g.star formation history). We compare the model results with the observations and dis-cuss about the possible explanations. We nd that the dust opacity functions derivedfrom studies of asymptotic giant branch stars are useful for modeling a galaxy with adusty disk.