The combination of grid computing and information retrieval is the main development direction of information retrieval in the future. This paper discusses the main components of the grid information retrieval system, and the key technologies are analyzed in depth, a simple andpractical model of the grid information retrieval system is designed and implemented. The experiment shows that the system realizes the information retrieval function based on semantic grid which can realize the precise semantic matching according to the specific context of the concept. The retrieval recall factor and pertinency factor can be improved greatly, and the search request of the users can be satisfied.