A novel optical fiber Fabry- Perot pressure sensor using a corrugated diaphragm is presented. The mechanical model of corrugated diaphragm is analyzed and the parameters are optimized by simulation. The structures of the sensor and the production methods are elaborated. Pressure tests are carried out by employing the micro-pressure sensor testing system. Experimental results demonstrate that the sensor has reasonable linearity, sensitivity and repeatability in the range of 0 to 0.1 MPa.