In this papper, we have conducted on obatain new types of organic additives in order to improve the number of octane for gasoline Which containing oxygen and nitrogen. All of them synthesed based on the follow chemical compounds, triacetin (TA), diisoamyl phthalate ether (DIAP), N-methylaniline (NMA), isoamyl acetate (IAA), isopropanol alcohol (IPA), methyl alcohol (MS) and urotropine. The results showed that, the effect of additives on the concentration of toxic gases emitted into the air as a result of combustion in the engine was studied by compounding with local low-octane gasoline and its various fractions.