In this paper we present catalogs of photometric and spectroscopic data for M81 globular clusters ( GCs ) .
The catalogs include B - and V - photometric and reddening data of 95 GCs , and spectroscopic metallicities of 40 GCs in M81 .
Using these data , we make some statistical correlations .
The results show that the distributions of intrinsic B and V colors and metallicities are bimodal , with metallicity peaks at [ Fe / H ] \approx - 1.45 and -0.53 , respectively as has been demonstrated for our Milky Way and M31 .
The relation between spectroscopic metallicity and intrinsic B and V color also exists as it does for the Milky Way and M31 .