A novel distributed sensor system based on Fiber Bragg Grating (FBG) sensing technology is proposed. In huge project, there are often one hundred positions to be monitored. If these positions are divided into several groups and every group has four fiber Bragg gratings with the same wavelength, it can implement one hundred fiber Bragg gratings on one fiber. If the temperature of one point is varied, the largest temperature of the group can be obtained. The system will alarm if this temperature is over set value. Based on the theory analysis, temperature experiments of different wavelength have been done. In 10～110°C, the central wavelength of FBG varying with the temperature has fine linearity. It has been seen in experiments that the system has the characteristics of the high measured precisions, good reliability and low cost in distributed multimetering.