Abstract: Industrial computed tomography(ICT) is an advanced means for nondestructive testing. Traditional filtered backprojection(FBP) method required complete projection data, which were often difficult or even impossible to acquire for objective reasons. The algebraic reconstruction technique(ART) was proposed to reconstruct image from incomplete projection data. The factors influencing reconstruction speed and quality of ART were analyzed, the reconstruction quality of the two methods was compared by simulation experiments. The results showed that the reconstruction quality of ART was better than FBP when the projection data were incomplete.