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Several factors influencing the C H bonds of a-C:H were investigated with atomic cluster models using ab initio molecular orbital theory. The lengths of C H bonds were optimized and the Mulliken bond orders of C H were performed. The results show that the doped atoms and boundary dangling bonds can weaken and lengthen C H bonds largely and the presence of lattice vacancies only influences the C H bonds to a small extent. The results are discussed on the basis of cloud distributions and the changes of dipole moments of the clusters. Our results agree reasonably well with some of the experimental ones obtained by other groups.