中文摘要：

研究了三粒子纠缠随观测者加速的变化情况，发现纠缠随着加速度的增加而减少，当观测者都加速时π-tangle减小最快。讨论了量子信息的分布，纠缠和互信息都会重新分布到物理上不可到达的区域；相对论效应下的保真度随观测者加速度的增加而减少，一定程度上说明了纠缠和保真度是有关联的。

英文摘要：

The tripartite entanglement changing with the observer＇s acceleration is investigated. It is found that the entanglement decreases with increasing of acceleration.π-tangle decreases most quickly when three observers are all accelerating. The distribution of quantum information is discussed. It＇s found that the entanglement and mutual-information can be redistributed, and they can reach the physical inaccessible region. The fidelity under the relativistic effect decreases with increasing of the observer＇s acceleration, which indicates that the entanglement and fidelity are related to a certain extent.