The non-destructive test of concrete structure is the importent problem in civil engineering field and is regarded as the key to ensure safety and durability of large concrete construction.Based on the introduction of rule and method of non-destructive test on ground-penetrating radar, the paper took hydraulic tunnel lining concrete as the measured object, and applied ground-penetrating radar method to test and verify concrete thickness, internal rebar distribution and internal defect. Through the comparison between the detection results by ground-penetrating radar and that by drilling core,it analyzed the precision and deviation of ground-penetrating radar method.The research shows the results of non-destructive test by ground-penetrating radar method are reliable and can meet the requirement of quality control in construction of engineering, the application of non-destructive test in water conservancy engineering is feasible.