With　the　advantages　of　convenient　communication　and　low　cost,　wireless　sensor　network　(WSN)　is　widely　used　in　many　areas　for　information　collection,　and　LEACH　protocol　is　one　of　the　routing　protocol　used　in　WSN.　Therefore,　optimizing　LEACH　protocol　can　improve　the　performance　of　WSN,　including　the　speed,　lifecycle　and　coverage.　The　optimization　of　LEACH　protocol　mainly　focuses　on　improving　network　energy　efficiency,　reducing　node　energy　consumption,　improving　ways　to　select　cluster　head　nodes,　and　extending　network　lifetime.　On　the　basis　of　extending　the　network　lifetime,　this　paper　optimized　the　energy　allocation　and　choosing　cluster　heads.　With　our　method,　the　new　energy　threshold　is　established,　and　the　nodes　whose　energy　is　lower　than　the　threshold　is　not　eligible　to　compete　for　cluster　heads.　The　amount　of　cluster　heads　that　can　minimize　the　total　energy　consumption　of　the　network　is　found,　as　well　as　the　optimal　P-　value　is　confirmed.　The　threshold　formula　for　selecting　cluster　heads　is　optimized.　The　final　results　of　simulation　show　the　optimized　node　death　time　is　significantly　later　than　that　before　optimization,　which　can　prolong　the　network　lifecycle　of　LEACH　protocol.　　©　2023　IEEE.