Glass fiber reinforced polymer（GFRP）material is widely used in aerospace

pipeline and other engineering fields because of its favorable characteristics including light weight

high strength

corrosion resistance and good electrical insulation

etc.Due to severe environments

it is prone to the localized material loss（LML）resulting from impact

which undermines the structural integrity of GFRP.Therefore

it is imperative to detect and evaluation LML in GFRP via effective nondestructive testing（NDT）methods.Compared with other NDT techniques

microwave NDT has the advantages in terms of high sensitivity

non-contact and efficient inspection without coupling agent

etc.Feasibility of microwave NDT of LML in GFRP in conjunction with microwave reflectometry is intensively investigated through experiments.The experimental results confirm the validity of microwave reflectometry for the visualization and quantitative evaluation of LML in GFRP.