Abstract: A method of installing or exchanging a rubber seal for an expansion joint is provided, which includes installing guide rails for detachably mounting the rubber seal on both vertical parts of lower plates, installing a plurality of guide rollers at both ends of the rubber seal in a longitudinal direction thereof using guide roller fixing members to slidably fix the rubber seal to the guide rails, suspending wires from a lower one side of the expansion joint to an opposite side thereof to a sufficient length to pull the rubber seal, fastening one end of the wire to a wire hole of the guide roller fixing member coupled to the rubber seal from a start point of pushing the rubber seal, inserting a portion of the guide roller fastened to the wire into one start point of the guide rail and pulling the wire from the other termination point of the guide rail, and after inserting the rubber seal, cutting the rubber seal to the length between both ends of the guide rail or the length of the expansion joint and fixing th