Fiber Bragg gratings (FBG) using as pressure, temperature, and strain sensors are triumphantly applied in optical sensing fields in recent years. However, the sensitivity of a bare FBG is insensitive to the ambient environment. So it is necessary to package FBG to enhance its sensitivity. Two polymers are mixed together to package fiber grating. Pressure experiments are studied at 23℃. It can be seen that fiber grating packaged with polymers is high sensitivity for pressure in the range from 0 MPa to 10 MPa. The measured pressure sensitivity is -1.22×10-4/MPa, more than 62 times than that of a bare fiber grating.