Abstract: The concentration process of titanium into rutile phase in the high-titanium slag was observed at different quenching temperatures using the high-titanium slag produced from the titanium concentrate in Panxi area as raw material,and the precipitation and growth kinetics of rutile were also investigated. The results show that there are two ways for the precipitation and growth of rutile in the non-isothermal process,including the spontaneous growth of rutile phase with a certain saturation of crystals and the gradual growth of rutile caused by the increase of free energy in the system as a result of the interfacial stress between the rutile and slag. The precipitation and growth kinetics of rutile phase can be approximately expressed by JMAK equation. The lower cooling rate,the more rutile phase and the larger size of crystals can be obtained in the system.