Abstract: The digital transformation of new power systems needs the support of intelligent application system. Firstly, the critical challenges in the construction of intelligent application for the new power system are discussed. A generative intelligent application mode and its logical framework for new power systems based on large language models are proposed. And the technical schemes for realizing the automatic construction of intelligent application in the entire lifecycle in this mode are explored. Secondly, according to the requirements of system simulation, typical cases of generative intelligent applications are introduced, and the characteristics of the related technical schemes are explained. Finally, the development trends and research directions of generative intelligent applications are prospected, which provide reference for future researchers.