Based on the temperature of hangang wide-thick slab continuous casting mold copper plate measured by thermocouple,the finite element heat transfer model and non-linear model were built to estimate the heat flux. Taking the results of back calculation model for getting heat flux of copper plate,and contrasting with the average heat flux calculated by heat balance,we demonstrated the validity of modelto confirme the heat flow formula of copper plate wide and narrow surface. The temperature distribution of copper plate was analyzed at the same time. The temperature curve of copper plate hot and cold sides are of a wavy distribution,the temperature of hot side changes more gently,cold side has the largest temperature difference as 29. 4 ℃. The temperature of copper plate decreases with the increase of the distance to the meniscus,but the temperature back to rise at 23 ℃.