First,　catalyst　precursors　were　prepared　by　the　impregnation　method,　i.　c.,　impregnating　the　ordered　mesoporous　molecular　sieve　SBA-15　in　silver　ammonia　solution;　next,　a　series　of　Ag-NH3/SBA-15　catalyst　samples　were　obtained　under　different　preheating　temperatures,　and　their　catalytic　performance　for　hydrogenation　of　dimethyl　oxalate　(DMO)　to　prepare　methyl　glycolate　(MG)　were　also　investigated.　The　results　show　that　an　appropriate　preheating　temperature　(c.　g.　623　K)　is　beneficial　to　the　generation　of　more　Ag2O　particles　which　can　form　the　Ag—O—Si　bonds　with　silicon　hydroxyls,　thus　inhibiting　the　agglomeration　of　Ag　species　and　improving　the　dispersion　of　Ag　species　on　surface.　Meanwhile,　it　is　also　beneficial　to　the　formation　of　more　active　sites　of　Ag＇5-　with　partial　positive　charge,　so　that　H2　molecules　can　be　easily　activated　to　further　improve　the　activity　of　Ag-NH3/SBA-15　catalyst.　At　the　temperature　of　483　K,　the　pressure　of　2.　0　MPa,　the　H2/DMO　molar　ratio　of　100　and　the　mass　liquid　hourly　space　velocity　(MHSV)　of　1.　4　h-1,　under　the　catalysis　of　Ag-NH3/SBA-15-623K,　the　DMO　hydrogenation　conversion　is　97.　9%,　MG　selectivity　and　yield　arc　94.　9%　and　92.　9%　respectively.　©　2023　Science　Press.　All　rights　reserved.