Based　on　the　minimum　mean-square　error　approach,　a　computational　method　was　proposed　for　locating　the　positions　of　underwater　explosion　sources.　The　verification　experiments　show　that　the　proposed　location　method　can　meet　with　the　test　requirements　when　the　quantity　of　the　effective　data　observed　by　the　pressure　sensors　is　not　less　than　four.　Satisfactory　computational　results　can　still　be　obtained　even　if　the　accuracies　of　several　test　data　are　weak.　The　influencing　factors　of　the　computational　error　were　discussed　as　follows:　veracities　of　test　data,　position　turbulence　of　test　points,　accuracies　of　model　parameters　and　quantity　of　test　points.　Consequently,　some　suggestions　were　put　forward　about　the　location　computation　for　underwater　explosion　sources.