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In this third paper of our series, we present CCD spectrophotometry of 78star clusters that were detected by Chandar, Bianchi, & Ford in the nearbyspiral galaxy M33. CCD images of M33 were obtained as a part of the BATC ColorSurvey of the sky in 13 intermediate-band filters from 3800 to 10000{\AA}. Byaperture photometry, we obtain the spectral energy distributions of these 78star clusters. As Chandar, Bianchi, & Ford did, we estimate the ages of oursample clusters by comparing the photometry of each object with theoreticalstellar population synthesis models for different values of metallicity. Wefind that the sample clusters formed continuously in M33 from $\sim3\times10^6$ -- $10^{10}$ years. This conclusion is consistent with Chandar,Bianchi, & Ford. The results also show that, there are two peaks in clusterformation, at $\sim 8\times10^6$ and $\sim 10^9$ years in these clusters.Comment: 29 pages, one figure is gif form, will appear in the June 2002 issue  of A

Spectral Energy Distributions and Age Estimates of 78 Star Clusters in M33