All-silica fiber extrinsic Fabry-Perot interferometer (EFPI) high static pressure sensor in fusion with simple structure is introduced. The pressure effect of the sensor is theoretically analyzed, and the design structure and manufacturing process of the sensor are given. The sensor has some advantages such as long cavity length, simple structure, simple manufacturing process, convenience and flexibility in application comparing with traditional EFPI sensor, while it can be used in the measurement of higher static pressure. Sensing demodulation system is set up to conduct a pressure test. The results show that the system has high measuring precision and good stability. Meanwhile ,the temperature sensitivity measuring experiment is conducted. Temperature sensibility coefficient is about 0.72 nm/℃ and the cavity length-temperature has good linearity. The results show that the sensor has a low temperature crossing sensitivity. In specific pressure of 0~20 MPa, pressure cavity length sensitivity of the sensor can reach 21 nm/MPa. Measuring deviation is 0.2%FS with continuous dynamic measurement of 10 h.