The product quality of color coated steel sheet is not only based on the basic characteristics of plate and architectural coating, but also on the production process and practical operation control system. The actual operation of the control system has a great negative impact on the technological performance of the color coated products. From the production process analysis, the top priority of the production and manufacturing control system should include four stages: cleaning solution, chemical coating solution, spraying and dry fixation. Now let's understand the study of the support and deformation of the lower color coating roll.The calculation of the thermal stress of the coil in the process of color coating and unwinding is based on the calculation of the differential equation of the coil as a thin-walled or malleable tube. In fact, the color coated roll is usually very thin and thick, and the color coated roll has significant non-circular characteristics along the circumference. If the color coated roll is solved according to the circular curve, the calculation error will be very large. Therefore, in the whole process of hot-dip color coating and unwinding, it is more obvious that the thin and thick lifting coil steel internal strip is non-circular along the circumferential direction, while in the past, the closed circular bucket type entity model of circumferential symmetry not only has a large error with the actual situation of the strip, but also can't accurately divide the slip between the folding layers, and fully integrate the machinery, equipment and processing in the whole process of hot-rolled coiling According to the characteristics of the process, the spiral open mouth barrel type method is selected, and the uneven distribution of the in-situ stress and deformation along the circumference in the whole process of unwinding is fully considered, and the sign that the coil head ring and the wire rope drum are not completely touched is not fully considered. A set of in-situ stress distribution entity model suitable for the hot tie color coil unwinding is clearly proposed, the relative interlayer slip resolution standard is obtained, and the phase is customized The mobile phone software for forecasting in-situ stress and interlayer slip in coil steel is applied to production practice.