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Two novel diphoshinoamine ligands have been synthesized. Combination of Cr(Ⅲ)and methylaluminoxane(MAO) generated active catalytic system which can catalyze tetramerization of ethylene with high catalytic activity up to 2.5×10 g/mol Cr.h and high selectivity to produce 1-octene (C8 in products is being 89.80 wt%).