With the increasing application of Magnetic Resonance Imaging and Magnetic Resonance Spectroscopy in brain tumor diagnosis, a data sharing platform becomes an issue for the storage and management of a large amount of data. In this paper, by using the B/S/S structure of MYSQL +Apache+PHP, a Web-based brain tumor decision support system is designed and developed, with the Zend framework which supports the MVC pattern, the user information management, the patient medical record management, and the quick and effective searching, downloading and uploading of the data of the Magnetic Resonance Imaging and Magnetic Resonance Spectroscopy data. The system also provides functions for doctors to find out the location and size of the tumor in brain. The system can be used by doctors, spectrum researchers and three-dimensional reconstruction staff. The importance of Magnetic Resonance Spectroscopy on future research of brain tumor, and the practical value of this web system with respect to the remote medical information sharing and diagnosing are also discussed.