With the advantages of good stability

high precision and good electromagnetic resistance

the Fabry-Perot（F-P） strain sensor get increasing applications in the bridge structure status monitoring.The basic principles

combination and system of F-P strain sensor are introduced

and the system is utilized into the practical bridge status monitoring.The results show that the acquired data of F-P strain sensor can effectively describe the strain variation with the temperature change

the monitoring system works sound and effectively.