MTR(maximum transition run)code is highly rated under the recent demand on higher density recording. In this paper, we introduce two-dimensional simplest MTR code with trellis function and investigate the effectiveness of the combination with TCPR4(trellis coded partial response 4) ML and this code, where the simplest means that all of more than three continuous level transition pattern are removed from the write-in waveform. The results show that bit error rate with this combination can hold the superiority over the combination with conventional PRML and this code.