The cells cascaded multilevel frequency converter has many perfect characteristics, such as good output waveform, low harmonic, no filter and so on. The multi-carrier arithmetic is analyzed after the introduction of the multilevel cascaded converter. In order to reduce the cost and accelerate the step of researching, the building of system module and simulating of multi-carrier arithmetic have done by MATLAB software. The results show that this kind of converter can choke back the voltage changing rate and common-mode voltage and the harmonic wave content can also decrease. The results are in accord with theoretical analysis, which proves that it is feasible to use MATLAB software to analyze the system of multilevel converter. And another new way is offered to analyze cells cascaded frequency converter.