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This paper presents CCD multicolor photometry for 304 old star clusters inthe nearby spiral galaxy M31. Of which photometry of 55 star clusters is firstobtained. The observations were carried out as a part of theBeijing--Arizona--Taiwan--Connecticut (BATC) Multicolor Sky Survey from 1995February to 2008 March, using 15 intermediate-band filters covering 3000--10000\AA. Detailed comparisons show that our photometry is in agreement withprevious measurements. Based on the ages and metallicities from Caldwell et al.and the photometric measurements here, we estimated the clusters' masses bycomparing their multicolor photometry with stellar population synthesis models.The results show that the sample clusters have masses between $\sim 3\times10^4M_\odot$ and $\sim 10^7 M_\odot$ with the peak of $\sim 4\times10^5 M_\odot$.The masses here are in good agreement with those in previous studies. Combinedwith the masses of young star clusters of M31 from Wang et al., we find thatthe peak of mass of old clusters is ten times that of young clusters.

Spectral Energy Distributions and Masses of 304 M31 Old Star Clusters