The realization of SVPWM rapidly is a key issue in expanding the application of multilevel converter. To solve this problem, different multilevel SVPWM algorithms based on different coordinates were studied. But there was no comparison analysis report on the speed of these algorithms. For this purpose, a rapidity analysis of 4 typical multilevel SVPWM algorithms in different coordinates was researched. Theoretical analysis and experiment results have shown that the multilevel SVPWM algorithm in 45° coordinate has fewer calculations and is suitable for optimal control. So the multilevel SVPWM in 45°coordinate is recommended.