Based on the fiber Bragg cladding mode, an all fiber sensor for online bending monitoring was fabricated. The 193 nm ArE excimer laser was used to inscribe the grating on the 15 mm singlemode fiber through the off-axis inscription. The response characteristics of the sensor′s bending and temperature variation were theoretically analyzed. The bending response characteristics of the sensor were experimentally investigated in the range of 0～1.2 m-1.The result showed that the response sensitivity to the bending was 0.11 dB/m-1 and the linearity was 0.996 with the increse of bending curvature and the decrease of cladding mode,and higher sensitivity and linerarity were presented. As the ambient temperature changed from 25 ℃ to 60 ℃, the sensitivity of the peak wavelength response of the sensor was 0.02 nm/℃. It was demonstrated that the proposed sensor was insensitive to temperature disturbance. Because of its simple structure, convenient production and high precision, it has a good application prospect in the field of structural health monitoring of the oil and gas pipelines.