This study consisted of two experiments. In experiment 1, an A-B-A design was used to assess the effects of a token economy program to increase the productivity level of three target jobs (such as cakemaking, gquze folding and printing cards). The subjects were 18 moderately and severely workers retarded in the vocational training class of a public institution. In experiment 2, the effects of combined strategy (including token economy, isolated work table and on-task reinforcement) on productive rates of setting book covers were evaluated within a combined delayed multiple baseline and multitreatment design. The subjects were two moderately, nine severely and three profoundly retarded workers in a private sheltered workshop. The major findings of the study were as follows: (1) The token economy program helped not only to facilitate the vocational skills, but also to increase the productive rates for all subjects in a variety of tasks; (2) The work condition containing isolated work table for each subject enhanced his productivity except two autistic cases; (3) for some subjects, reinforcement for general on-task behavior failed to result in increased productive rate