Abstract: The Zirconium dichloride (zirconium salicylaldehyde aniline), a [N,O] zirconium nonallocene complex, was synthesized. The structure of the complex was investigated by means of spectrum analysis. The catalytic activities and selectivities of the zirconium complex with Et2AlCl as co-catalyst in ethylene oligomerization were studied under different reaction temperatures, Al/Zr ratio, and various electron donors. Under optimal reaction conditions, the activity was 11 636 g / (gZr?h )，and selectivity of the α- olefin was 97.8%.

Key words: ethylene oligomeration, zirconium, temperature, Al/Zr mol ratio, electron donor