Metallocene catalyst was prepared based on the SINOPEC[DK]’s “Metallocene Adduct Technology”.Great effort was paid on the support procedure to obtain the supported catalysts. The supported catalysts were evaluated in slurry

loop slurry and gas phase fluidized bed pilot plant of polyethylene processes respectively. The metallocene adduct catalyst could catalyze the polymerization of ethylene as well as the co-polymerization of ethylene with α-olefin. Based on the pilot plant experiment results the commercial trial was carried out successfully in a 60000 t8226;a-1 plant of gas phase fluidized bed polyethylene process for the production of metallocene-based linear low density polyethylene. The resin-grade switching technology between metallocene adduct and Ziegler catalyst was investigated. The influence of the supported catalyst composition and the polymerization controlling parameters on the properties of the obtained polyethylene resin was also studied.The processability and performance of the film-grade resin seem to be acceptable as compared to the analogous materials in the commercial mLLDPE market.