This invention relates to transition metal catalyst component chelated by chelate ligand, a catalytic system comprising the transition metal catalyst component in the presence of magnesium halide, and a process for olefin polymerization using the catalytic system. The preparation of chelated transition metal catalyst component[A] are prepared by the unique synthetic method, in which Mg[AlR'(OR).sub.3 ].sub.2 reacts with chelate ligand to form Mg--Al-chelate ligand complex containing chelate ligand, and this complex reacts with metal halide compound to prepare chelated transition metal compound which is quite soluble in non-polar solvents. The olefin polymerization is performed using a catalytic system comprising the chelated transition metal catalyst component[A], MgCl.sub.2 support component[C], and an organoaluminum cocatalyst component[B]. Such polymerization produces a polymer having narrow molecular weight distribution, narrow compositional distribution, excellent morphology, and good processibility.

_ este invenção relacion transição metal catalizador componente chelated chelate ligand, um catalytic sistema comprising transição metal catalizador componente presença magnésio halide, e um processo para olefin polimerização using catalytic sistema. _ preparação chelated transição metal catalizador component[A ] est prepared original sintético método, que Mg[AlR'(OR).sub.3 ].sub.2 reaj com chelate ligand formulário magnésio -- Al-al-chelate ligand complexo containing chelate ligand, e este complexo reaj com metal halide composto prepar chelated transição metal composto que est completamente soluble non-polar solvente. _ olefin polimerização est execut using um catalytic sistema comprising chelated transição metal catalizador component[A ], MgCl.sub.2 suport component[C ], e um organoaluminum cocatalyst component[B ]. _ tal polimerização produz um polímero t estreito molecular peso distribuição, estreito compositional distribuição, excelente morfologia, e bom processibility. _