采用差分方程求解一定温度环境下物体内部的温度场情况-Taking into account the equipment and technology characteristics of CAPL , in allusion to the feature of the edge of the strip contact with the surface of the furnace roll in continuous annealing process, based on mechanic knowledges, started from the different elongation between the edge and the center of the contact part of the strip, taking into account the special relationship that the average of Transverse Tension Distribution is equal to the assigned tension in this technology part.