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In recent years,boron and boron based clusters have attracted much attention due to their intriguing physicochemical properties.Most theoretical studies of the boron oxide clusters have focused on BnOm species whose relationship of n and m leaves stoichiometry,and diboron trioxide (B2O3)n clusters received little attention.In the present work,we studied systematically on the geometric and electronic structures of (B2O3)n (n = 1-6).Most of the low-lying isomers are described here for the first time,but there are strong indications that the DFT procedure chosen is particularly well suited for the task.The results show that the GM structures are planar at n=1-3,and cage at n = 4-6.The 4-membered ring (-BOBO-) and 6-membered ring (-BOBOBO-) are found stable in (B2O3)n clusters.The NICS value at the center of some isomers is calculated,which shows that most of isomers are aromatic.In order to get insight into the chemical bonding of (B2O3)n clusters,we analyzed the electronic structures of some representative GMs.The work reported herein provides crucial information towards understanding (B2O3)n clusters.