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We investigate the up-conversion luminescence spectra of Ho3+-Yb3+ co-doped materials excited with two typesof laser. It is found that the efficiency of green emission (5S2-5I8) can be enhanced by restraining the transition of5S2-5I7 since the two types of radiation both start on the 5S2 level. We propose an important approach to enhance anexpected up-conversion emission.