In order to satisfy new topology structure emerged continuously，a general modulation algorithm for multilevel converter based on target waveform and logic combination is proposed.The algorithm in accordance with the traditional modulation algorithm，the target waveform and primordial operation waveform of the equivalent multilevel converter are given.The real operation waveform of power devices can be attained by proper logic combination of primordial operation waveform，in order to obtain the real output waveform of multilevel converter identical to target waveform.For instance，by using proposed modulation algorithm for hybrid cascaded multilevel converter，a concrete implementation method is given，which is verified by simulation and test.Simulation and test results show that this algorithm is simple，easy to implement，in common use without dependence on topology structure and suitable for various multilevel converters.