One-dimensional chain struct utes of Bn (n= 6-16) are calculated by employing a 6-311 G* basis set. The present calculations show that all the chain structures of interest have local minima with large binding energy per atom and short bond length. It is also found that many previous reported structures of B6 and B7 clusters are saddle points and the one-dimensional chain structures are the corresponding ground-state structures of 1B6 and B7clusters.