Abstract: In computed tomography (CT), samples usually need to be scanned in 360 degree to obtain sufficient projection data. However, there exist difficulties for CT in inspecting large or flat samples because of geometry limitations and the high absorption close to the sample surfaces. Under these circumstances, computed laminography (CL) provides an effective alternative. Firstly, this paper summarizes researches at home and abroad recently; Secondly, principle, reconstruction algorithms and applications of CL are introduced systematically; At last, CL is compared with CT in image quality.