Abstract: A manufacture technology for high quality red iron oxide with ferrous chloride crystals as raw materials was studied.The red iron oxide was obtained through the process of crush，then put in a high temperature fixed bed reactor full of oxidation atmosphere.The influences of oxidation temperature and reaction time on the phase，purity，hue，oil absorption，and particle size of the product were mainly investigated.The relationship between oxidation temperature and reaction time was also discussed.Through experiments，the optimal technological conditions of preparing high quality red iron oxide were obtained as follows：oxidation temperature of 400 ℃ and oxidation time of 60 min.Under the optimal conditions the parameters of the prepared product were as follows：purity was 99.5%，color was pure and bright，particle size was at 100~150 nm，and oil absorption was 0.241 g/g. Through studying the relationship of oxidation temperature and reaction time，it was found that higher oxidation temperature with shorter reaction time，i.e.the reaction process had a time-temperature equivalence principle.

Key words: ferrous chloride, high temperature oxidation, red iron oxide, process condition