With the rapid advancement of agricultural modernization, biodegradable mulch （BDM） in farmland has become increasingly prevalent. However, little is known about the effects of BDM buried in soil on bacterial communities. In this study, a burial experiment was conducted on farmland using BDM （PBAT+PLA）. The bacterial communities on the surface of the BDM （H8） at different burial stages were analyzed through Illumina NovaSeq high-throughput sequencing technology. The landfill experiment was carried out for a total of 75 days. The results revealed that the bacterial