微纳光纤的大倏逝场在光纤传感领域具有巨大应用前景。分析了微纳光纤拉制过程中影响外形控制的因素。通过改进拉制工艺和合理设置参数来提高微纳光纤外形结构控制精度，实测两根微纳光纤外形结构，表现出良好的一致性。理论仿真了吸附微颗粒与微纳光纤附加损耗的关系，实现了对空气中微颗粒吸附过程的在线监测及对吸附2 μm直径氧化铝颗粒的计数功能。分析了液体吸收系数与微纳光纤附加损耗的关系，通过测量微纳光纤传输附加损耗，实现了对不同液体吸收系数的测试。

The large evanescent field of optical micro-nano fiber (OMF) has enormous prospect in optical fiber sensing. In this paper, the factors that affect OMFs profile during taping process are analyzed. Accurate OMFs profile can be tapered by improved art and choosing proper parameters. Two OMFs is tapered and their profiles coincide well. The relationship between adhered particulates and additional loss of OMF is theoretically simulated, and the corresponding experiments are carried out by using dust in air and 2 μm-in-diameter alumina particulates. The relationship between absorption coefficient of liquid and additional loss of OMF is also calculated, and the absorption coefficient of different kinds of liquids are tested.