Abstract: Schemes of trellis coded multi-h continuous phase modulation (CPM) have been shown in the literature to have attractive power-bandwidth performance at the expense of increased receiver complexity. In these schemes, the format of multiple indices is made to be associated with the specific pattern and repeated rather than cyclically changed in time for successive symbol intervals, resulting in a longer effective length of the error event with better performance. In this paper, the pattern of multiple indices has been designed based on super trellis which is constructed by trellis encoder and continuous phase encoder. The effective length of the merged encoder and the Euclidean distance of the minimal error event have been increased greatly based on further analysis. Simulation results show that a scheme combining rate 1/2 and 2/3 trellis codes with 4- and 8-level dual-h CPM is shown to achieve 1.4dB and 1.7dB performance gain respectively than the scheme with single-h.