Abstract: The paper aims to construct an intelligent large language model fund decision support system based on GPT to effectively deal with the complexity of financial markets.Through the large language modeling technology,the system provided deep fund and project insights along with risk measurement.Built with Python and Flask,it integrated OpenAI GPT models and enhanced the efficacy of pre-investment management,initial screening,scoring and risk assessment through embedded AI models,so as to improve overall decision-making efficiency.Future improvements included optimization of the model and expansion of the system.This innovation would drive digital transformation in the financial sector and further improve investment efficiency.