In situ high-pressure energy dispersive X-ray diffraction (EDXD) experiments on framework silicate sodalite were carried out by using the diamond anvil cell (DAC) device with a synchrotron radiation source at Beijing Synchrotron Radiation Facility (BSRF). The maximal pressure recorded at room temperature in these experiments reached as high as 17.4 GPa. It was observed in this pressure range that sodalite underwent a phase transition at about 3 GPa and that the d- 222 value showed an abnormal increase when the pressure was higher than 6.3 GPa. The experimental results are explained on the basis of the pressure effects upon the cage and tunnel structures in sodalite.