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In this work,we have studied bent and planar M2N2 configuration using the DFT method in a series of complexes [LnM]2(μ-η2:η2-N2)(M=Ta,Nb,Zr,Hf,Mo and W).Our studies indicate the existence of several factors that lead to more stable bent configuration:(1)the availability of free single electron in metal atoms which leads indirectly to the bonding interaction between two metal atoms,(2)not remarkable steric effect around metal centers,(3)the cis conformation of the ligands in dinitrogen complexes.Furthermore,bent and planar structures could be converted to one another in binuclear dinitrogen transition metal complexes with small steric hindrance.