Abstract: Farmland environmental quality is important for safeguarding the quality and safety of agricultural products. At present, due to the majority of farmland environment quality evaluation systems lack of available models and simple function structures, most systems are difficult to use to realize cross-platform data sharing, distributed data access and heterogeneous spatial data interoperability. Furthermore, they are unable to realize, from sampling design, environment quality evaluation analysis, crop suitability evaluation and early warning analysis. Based on related knowledge of farmland environment quality monitoring, this study established an appraisal model for optimizing sampling distribution, and then integrated GIS, GNSS and RBAC technology. It designed the system for farmland environment dynamic monitoring and evaluation, which can realize data online sharing, data query and statistics analysis and farmland environmental quality evaluation analysis. The application of the system showed that using Geo-WebServices technology can realize real-time online integrating and sharing with distributed storage high resolution of remotely sensed imageries and large scale fundamental geographical data. This, in turn, can improve the accuracy of data analysis and solve problems of sharing security and data copyright of the high-precision spatial data. Meanwhile, by designing permissions and roles and distributing them to users, the safety and reliability of the system can be guaranteed. What is more, the system functions to manage and customize the models for farmland environmental monitoring and evaluation and warning analysis bringing about both powerful analysis and intuitive visualization abilities for the dynamic management and monitoring of the whole process, such as sampling layout optimization and evaluation, sample point data pretreatment, environment quality evaluation and warning analysis, thematic mapping and so on. The system basically realized visual management of farmland environmental attribute data and spatial data share and exchange, for monitoring and evaluating soil environmental data, irrigation water environmental data and atmospheric environmental data with dynamic and efficiency. The system is effective for farmland environment quality monitoring and management.