A movement system comprises a bridge crane, a trolley and a movement device. The movement device comprises an attachment portion, multiple housings, a first bending element and a second bending element, a rope, and a rope angle sensor. The bending elements are pivoted and attached to the housings and are perpendicularly overlapped with each other, so that a first groove defined in the first bending element is perpendicular to a second groove defined in the second bending element. The first bending element can pivot around the first axis, and the second bending element can pivot around the second axis. The rope extends from the attachment portion and penetrates through every groove, and can pivot around a relative axis angle and shift to at least one bending element. The rope angle sensor is configured to measure angular displacement of at least one of the first and second bending elements.