According to the performance and dimension design regulated in the ISO2858 National Standard, it’s technical standard reaches national advanced level, and can be replaced by ISO type normal centrifugal pumps under the same working condition. Out of overall consideration of the impact of can loss and disc friction to motor performance, the length-diameter ratio of ISO2858 series canned motor pumps are optimized, so that motor efficiency is raised. Meanwhile, hydraulic model design is optimized to make pumps more efficient and more energy-saving.