Premium power park meets the special needs of users for power quality at the lowest cost，and has become a new way to solve the voltage sag problem，which has been widely applied at home and abroad． Aiming at the lack of cost － effective optimization configuration method for premium power park in China，a dynamic voltage restorer optimization configuration method based on process immunity is proposed． To achieve the governance goals for economics and reliability，the genetic algorithm is adopted to optimize the power quality level combining with the process immunity，by the constrains of meeting customers' short － duration voltage variation quality demand and taking the minimum cost of the sag mitigation equipment as the objective． Through the simulation analysis of a precise temperature control system，the proposed configuration scheme is more cost － efficient compared with the traditional one．