For the accurate simulation of prestressed concrete cyclinder pipe（PCCP） temperature field at steam curing stage, considering the relationship between the temperature and the chemical reaction rate, temperature impact factor based on the Arrhenius equation was proposed and introduced into the new concrete hydration degree formula；by the cement hydration heat test data, the new formula was fitted under different curing temperature. The results show that the fitting effect is good; thermal conductivity and hydration heat parameters expresses with hydration degree are applied in engineering practice and compared with the result of traditional analysis, the temperature field of PCCP is improved, which is more consistent with the engineering practice.