In the simulation analysis of roller compacted concrete(RCC) thin-layer rolling construction, laminated elements containing multi-layer materials are commonly used in order to improve the calculation efficiency, among which the growing element is the transition form of gradually forming laminated elements on the pouring warehouse surface. Because the temperature and elastic modulus of early concrete are very sensitive to age, and the performance of concrete in each roller compacted layer varies greatly, the conventional bilinear function method is prone to errors when describing the growing element in the finite element calculation. In view of this, the piecewise shape function method of growing element is proposed to solve the problem of low calculation accuracy caused by the large property difference of different layers of early concrete. In addition, in respond to the change of pouring warehouse surface, the shape and parameters of the growing element should be dynamically adjusted. The proposed growth processing techniques include the search and replacement of heat dissipation boundary, the initial value reset of new layer nodes, the unit connection of new and old concrete and so on. According to the example analysis, it is verified that the piecewise shape function method can greatly improve the calculation accuracy of the growing element, and the growth processing techniques can improve the application range of the growing element, which can be used as a reference for relevant research.