Abstract: Three 200mm thick reinforced concrete slabs were designed and made with typical simulated circumstance. Non-destructive test carried out on the slabs with different ages by using ground penetrating radar of Handy scan produced by GSSI company of United States. The software Radan was used for processing the detected radar signal. The characteristics of the radar image were studied and summarized; test results showed that radar with the center frequency of 1 GHz could identify the location of steel bars, protective layer thickness and the minimum distance and maximum depth of steel bars. The analysis results indicated that radar equipment used in the test could accurately detect objects location in the concrete with high credibility.