The　stratigraphic　sequence　of　Lower　Paleozoic　Weifang　Formation　and　Dongkengkou　Formation　in　southwestern　Fujian　has　long　been　a　problem　of　controversy.　In　this　paper,　the　authors　studied　geochronology　of　120　detrital　zircon　samples　from　the　Lower　Paleozoic　Weifang　Formation　and　Dongkengkou　Formation　sedimentary　rocks　in　southwestern　Fujian　by　LA-ICP-MS　U-Pb　dating,　and　obtained　zircon　ages　ranging　from　506Ma　to　3431Ma,　with　most　of　the　data　from　511Ma　to　2796Ma,　the　main　peak　value　964Ma,　a　secondary　peak　value　514Ma,　and　secondary　peak　values　813Ma,　1231Ma,　2483Ma.　Characteristics　of　the　age　spectrum　suggest　that　Weifang　Formation　was　deposited　earlier　than　Dongkengkou　Formation.　Age　of　Dongkengkou　Formation　does　not　belong　to　MiddleUpper　Cambrian.　Lower　Paleozoic　source　with　peak　value　at　964Ma　most　significantly　reflects　the　Grenville　tectonic　event.　The　authors　also　received　peak　value　age　of　514Ma　of　Pan-African　tectonic　event.　In　addition,　the　authors　found　Paleoarchean　zircon　ages　record.　Important　new　information　is　thus　provided　for　the　establishment　of　Lower　Paleozoic　stratigraphic　sequence;　source　studies.　©　2017,　Science　Press.　All　right　reserved.