Aiming at problem that traditional soil pressure sensors are lack of long-term stability

capability of anti-electromagnetic interferenceis is not strong

and metworking is difficult

a welding-structure dual-diaphragms fiber Bragg grating（ FBG） soil pressure sensor with self-compensation is designed

which can realize simultaneous measurement of two parameters of temperature and soil pressure. The sensor consists of dual-diaphragms and substrate.It makes easy packaging that the diaphragm and grating fixed column one take.The sensitivity coefficient is calculated and analyzed.According to analysis result

the packaged sensor is processed and pressure calibration and

temperature self-compensation characteristic experiment are carried out. Experimental results indicate that wavelength shows good linear relationship with pressure or temperature respectively.Pressure sensitivity coefficient is 528.1 pm/MPa with a linear fitting of 99.988 % while output resolution ratio is 0.19 %. Temperature sensitivity coefficient is 31.9 pm/℃ with a linear fitting of 99.998 %

at temperature range of 5

45 ℃

it has good temperature self-compensation capability

which meet the requirements of engineering application.