The　silicate　glass　micro-particles　of　co-doped　with　Er3+　and　Yb3+　were　prepared　by　a　combustion　process　and　characterized　from　the　spectroscopic　point　of　view,　with　the　aim　of　investigating　the　effect　and　mechanisms　of　upconversion　emissions.　The　upconversion　emissions　at　522nm　and　547nm　have　been　obtained　by　exciting　the　silicate　glass　micro-particle　[about　30　mu　m　in　diameter]　under　976nm　diode　laser　excitation.　The　excitation　intensity　was　up　to　about　1800W/cm(2).　It　was　observed　that　the　intensity　ratio　of　the　522-nm　emission　to　the　547-nm　emission　(I-522nm/I-547nm)　in　silicate　glass　increased　when　increasing　the　excitation　intensity.　I-522nm　became　larger　than　I-547nm　when　the　excitation　intensity　was　above　300W/cm(2).　It　is　proposed　that　the　phenomenon　resulted　from　the　rise　of　the　temperature　of　the　sample　measured.