Objective To introduce the operating principle and system composition of coupled multielectrode array sensors (CMAS) , and study the corrosion law of 16MnR steels buried in light aggregate concrete and bentonite. Methods The corrosion monitors were buried in outdoor environments of light aggregate concrete and bentonite, to study the corrosion law of 16MnR steels in these two surroundings. The speedup of dry-wet alternate accelerated corrosion was studied in lab by burying the detectors in laboratory wrapped pieces. Results The annual average localized corrosion rate of 16MnR steels was 23. 7 μm/ a and 0. 1 μm/ a in bentonite and light aggregate concrete, respectively. The average localized corrosion rate of 16MnR steels in bentonite and light aggregate concrete was 109. 1 μm/ a and 1. 7 μm/ a respectively by dry-wet alternate accelerated corrosion. Conclusion The localized corrosion rate of 16MnR steels in bentonite changed with the environment temperature. The light aggregate concrete had better corrosion prevention effect than bentonite on 16MnR steels. The accelerated ratios of dry-wet alternate accelerated corrosion were approximately 17 and 5 in light aggregate concrete and bentonite, respectively.