The invention provides a data storage system and method. The data storage system comprises a plurality of service nodes. Each service node comprises a receiving unit, a judging unit and an updating unit. The receiving units are used for receiving input data and storing the data into the corresponding data table according to the specified data type, and the corresponding data table is one of structural data tables built in a memory of the service nodes. The judging unit is used for storing the corresponding data table into other service nodes in a partition data table mode when the size of the corresponding data table exceeds the threshold value. The updating unit is used for updating a global data index table according to the storage address of the data, and the global data index table is used for storing data table partition indexes of all the service nodes. By the adoption of the technical scheme, the partition data table is built in the memory and forms a cluster in cooperation with multiple service nodes, network service performance can be improved, and rapid operation and statistics of mass information are supported.