An expandable data center is provided. The expandable data center includes a first movable container, a second movable container coupling with the first movable container, and a plurality of racks disposed within the first movable container and the second movable container. The size of the second movable container is less than that of the first movable container, so that the second movable container can be moved into the first movable container when a vehicle carries the first movable container and the second movable container from a place to another place. A plurality of sensors and/or detectors are disposed within the first movable container and the second movable container, respectively, for sensing and/or detecting one or more environmental parameters in the first and the second movable containers. A method for deploying a data center is also provided.