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Continuously increasing requirements for steel cleanliness makes essential the control of inclusion kind and quantity during ladle treatment. To do this the on-line running models are required. In this work a comprehensive model for inclusion development in gas stirred ladles is proposed which can be used for the process optimization. The feature for the present model is that many process parameters, which may influence the evolution of inclusions, are taken into consideration. The stirring conditions, reactions between steel and slag as well as refractory material, separation of non-metallic inclusions are taken into account as interacting parameter. FactSage and SimuSage package was employed as the thermodynamics database and simulation tools respectively. The evolution of steel and slag composition with time is calculated using the present model as well as the amount and composition of inclusions. The comparison between model calculation and plant data shows good agreements. The effect of influencing factors on inclusion amount and composition is presented. The calculation shows that the separation of inclusions has the strongest effect. The present model can be a very useful tool for simulation and optimization of ladle operation.