Air rotary table is widely used in devices, which require high accuracy of rotation such as rotary table of roundness measuring machines, angle measuring devices or angle grating devices. This paper presents results of design and manufacturing the air rotary table, with stability of rotary center of 1 um and load capacity up to 1000N in Department of Precise Mechanical and Optical Engineering Hanoi University of Science and Technology. Based on studying of structural design, analysis of the factors affecting the air-bearing working capacity, the authors can get closer to mastering the technology of manufacturing precision equipment such as: roundness measuring machine, angle measuring device and other devices which need high precision of rotation.