A fiber-optic Fabry-Perot(F-P) sensor formed by hollow core photonic crystal fiber(HCPCF) is applied in the SFDM/CWDM system.The cavity length of HCPCF F-P can reach several centimeters;in addition the effect of temperature on the measurement of strain is smaller.And we have optimized the manufacture of HCPCF F-P,and realized the multiplexing of six Fabry-Perot strain sensors.The experimental results show that a strain accuracy of ±20 με is achieved,which can meet the requirements of health moni...