It　is　well　known　that　the　Born　approximation　technique　is　highly　effective　under　weak　scattering　conditions.　In　the　paper,　a　cement　paste　cylindrical　specimen　with　complex　flaw　is　prepared　and　ultrasonic　measurements　are　carried　out　by　experimental　means.　The　measurement　area　is　restricted　in　the　plane　perpendicular　to　the　axis　of　cylindrical　specimen.　The　measured　wave　data　are　fed　into　the　approximate　technique　formula-the　inversion　method　and　cross-sectional　image　is　obtained.　We　find　that　good　results　have　been　obtained　for　strong　scattering　void　flaws　such　as　complex　flaw　in　cement　paste　cylindrical　specimen.