AMB (Active magnetic bearing) centrifugal compressor has been playing the key role in high end air-conditioning system. It owns the characteristics of oil-free, long life and high energy efficiency benefit. Therefore, it is the trend of the HVAC industry in the future. However, the high speed and high capacity AMB techniques are dominated by few foreign companies. In order to establish these techniques in Taiwan, Industrial Technology Research Institute (ITRI) has developed 90RT AMB centrifugal compressor. This paper introduces the design and assembly work of the compressor, and the performance verification on chiller system. The test results have been compared with the commercial AMB compressor in the market. The efficiency of ITRI compressor was higher than the commercial one while high loading. In term of this feature, it is more suitable for Taiwan and the countries which are in the subtropical climate area.