This study was conducted to find an odor reducible solution in Hwayang agricultural industrial complex. Civil complaints have lasted because of odor caused by recycled plastic producers. In order to understand the emission characteristic and concentration of key odor components, we investigated the complex odor and 17 odor compounds at 3 sites of five chemical facilities from march to october 2013. The results of complex odor showed 8~12 at a boundary of 5 facilities. The results of complex odor showed 6694, 3000, 1442 at an emission (stack) of 3 facilities, which exceeded the emission standard. The highest compound and its concentration of each site was different because each facility has different processes and use different raw materials. We suggested the suitable prevention facility for each company to reduce odor. We analyzed the odor contribution with the emission (stack) point of S, I, B and the inside point of W, J. S plant was Acetaldehyde (45%), I plant was Trimethylamine (32%), B plant was Styrene (35%), W plant was Hydrogen sulfide (42%), J plant was Hydrogen sulfide(41%). An objective of study is odor management area and will apply odor strict emission standards. A suitable prevention facility should be operated efficiently based on survey data to reduce odor. Keywords : Legally-designated 17 odor, Complex odor, Prevention facility, Hwayang agricultural industrial complex, Major odor compounds, Odor contribution