Abstract: To reduce the cost of development,Northwest Subcompany arrangemented the first dual branch TK908DH well in Tahe Oilfield nine zone. The TK908DH well based on branch well completion technical theory well-designed,at the same time through using of abroad advanced tools and technique and combining incorporation field practical situation proceed rigour completion operation, which obtained high yield hydrocarbon flow after the well completion. TK908DH well was an deepest well with dual lateral,and the difficulty of drilling run up to international grade scale TAML4 level. Due to deep hole depth increased construction operation difficulty,furthermore deep well’s casing inside diameter limited tools size.So a in-depth analysis and summing-up on TK908DH well’s well completion technology characteristic and success experience is important,it can reduce development cost and extend the application of multilateral well.