Citizen Judges Act (Act on Criminal Trials with the participation of Citizen Judge (Guomin Faguan)) Article 37

Where there is a vacancy of citizen judge in the panel caused by the dismissal of citizen judge or alternate citizen judge pursuant to the preceding two articles, the said vacancy shall be filled by the alternate citizen judge next in the sequence in accordance with the serial number pre-assigned to him or her. The vacancy of the alternate citizen judge thus created shall in turn be filled by the alternate citizen judge whose pre-assigned serial number is next in the sequence.Where there remains no alternate citizen judge to fill the vacancy of citizen judge, the court shall conduct the selection procedures all over again.
中文原文 國民法官法第37條
國民法官、備位國民法官因前二條之規定解任者,國民法官所生缺額,由備位國民法官依序遞補之;備位國民法官所生缺額,由序號在後之備位國民法官遞補之。
無備位國民法官可遞補國民法官缺額時,法院應重新踐行選任程序補足之。

English translation for reference only; the Chinese text prevails. Not legal advice.