Methods and Internet of Things (IoT) systems for information storage management based on a smart gas data center are provided. The method includes: when a smart gas platform stores data in the smart gas data center, determining an extraction feature and a value feature of sub-target data of target data; and determining a storage level of the sub-target data based on the extraction feature and the value feature of the sub-target data and storing the sub-target data in the smart gas data center according to the storage level; and when the smart gas platform reads the data from the smart gas data center: determining transmission execution data based on a transmission load and an importance score of a target smart gas platform and transmitting the data to the target smart gas platform based on the transmission execution data.