Abstract: Real time collection and precise location for production process parameters of continuous casting slab is the basis for the online determination of continuous casting slab quality and the online optimization of production process parameters.On the basis of the actual production experience,a new location method for production process parameters of continuous casting slab has been developed. The method,which based on the casting length modification,can locate the real time production process parameters to section of continuous casting slab and thus overcomes shortages of the traditional location method. In addition,the accurate locate production process parameters can be saved into information group identified by section of continuous casting slab.Based on this,model of continuous casting slab quality determination by LM-BP algorithm has been established and used to analyze information groups of section of continuous casting slab.The experiments demonstrated that the data collect method is of high accuracy and the model is of high accuracy.