Abstract: To research flexural behavior of laminated steel beams that the upper steel beam and the lower steel beam were combined into an overall beam by a new type of shear connectors，a simply supported laminated overhanging beam with a total length of 3 m was designed． The ultimate loads，failure mode，deflection，strain distribution and slip-load curve were obtained by the flexural test． The experimental results showed that the new connectors could effectively transfer shear; the laminated steel beam with the new connectors showed a good holistic resistant behavior; the strain distribution was close to the plane section assumption; the failure mode of the laminated steel beam was a local buckling near the support; the connector was not failed in the loading process; the laminated steel beam with the new connectors was able to meet the demands of the mobile box buildings．