Abstract: With the emergence of open grid service architecture （OGSA）, service grid is seen as a natural progression from computational grid.Because of the diversity and complexity of the applications, it is a large challenge for the research on service grid platform.Currently, all the representative information service systems are basically used to provide registry, publication, and management for computing resources, data resources and network resources, etc.However such systems couldn’t meet the requirement of service grid.An information service model, HowU information service, used for service management and organization is proposed in this paper.The information consistency of HowU information service is investigated with emphasis on how to guarantee service existence in grid area and service information validity in organization area.Finally the simulation and the performance analysis are given.