Mould fluxes use in continuous casting. Mould fluxes are added to the top of continuous casting mould in order to cover the liquid steel and prevent thermal loss and reoxidation of liquid steel and to absorb floated liquid/solid inclusions from the liquid strand. Since the molten steel is at a temperature of around 1550?C, a temperature is established across the mould powder layer and the carbon in the flux starts to burn off, it starts sintering and then melts to form a liquid pool of flux, which prevents oxidation of the steel. The liquid slag infiltrates into the gap between strand and mould (aided by the mould oscillation). The liquid flux partially solidifies leaving a slag film consisting of a solid slag layer (ca. 1-2 mm) and a liquid layer (ca. 0.1 mm), which provides lubrication to the newly formed shell. In the continuous casting process, mold fluxes have an important influence on the surface quality of continuous casting slab. Especially, the surface quality depends on viscosity and heat transfer of the infiltrated mold flux between the mold wall and the solidified steel shell. Generally, the basic composition of mold fluxes is CaO–SiO2–Al2O3–Na2O–CaF2, in which fluoride mainly controls the viscosity, solidification temperature, and crystallization behavior of mold flux films. These characteristics directly influence the lubrication and heat transfer of a mold flux Film. Mould fluxes are designed to meet the requirements for specific steel grades and different steel plant conditions. However, in the course of its use, the volatilization and acidification of fluoride poses a significant health hazard, causes environmental pollution and intensifies the erosion to continuous caster. In this case, developing fluoride- free continuous casting mold fluxes is of great significance. At present, the research on fluoride-free mold fluxes is mainly concentrated on the heat transfer performance of fluoride-free mold fluxes and there has been little research on viscosity characteristics done of fluoride-free mold fluxes. The present work adopted TiO2 to take the place of fluorine in mold fluxes and studies its heat transfer performance. Heat flux simulation equipment was developed and the heat flux density of titanium- bearing mold fluxes containing TiO2 was measured; in addition, a solid slag film was obtained. The crystallization behavior was analyzed. In this thesis an attempt has been made to prepare mold powder using TiO 2 and B 2 O 3 instead of CaF 2 and investigate the influence of basicity, amount of TiO 2 and B 2 O 3 on the viscosity and heat transfer of the samples. For this reason, the different composition of fluoride-free mold fluxes was constructed. By means an apparatus that had been made for measuring heat flux of samples, based on the water cooled mold copper was constructed. Also, a viscosity characteristic of the samples was analyzed. As well as, micro structure of the formed slags during the experiments was analyzed. And the relationship between micro structures and heat transfer was investigated. Key worlds: Continuous Casting , Mold Powder, Mold Flux, Fluoride-Free