Citizen Judges Act (Act on Criminal Trials with the participation of Citizen Judge (Guomin Faguan)) Article 21

In a trial with civil participation, the court shall, prior to proceedings on the trial date, randomly draw prospective citizen judges from the second roster of the potential citizen judges in the number required by the case and conduct necessary investigations to confirm the non-selection (or removal) either on the ground of disqualifications set forth in the in Article12, Paragraph 1 or on the ground of ineligibility set forth in Articles 13 to 15.Where the random selection referred to in the preceding paragraph did not produce the required number of prospective citizen judges, the court shall repeat the random selection process in accordance with the preceding paragraph.
中文原文 國民法官法第21條
行國民參與審判之案件,於審判期日之訴訟程序前,法院應自備選國民法官複選名冊中,以隨機抽選方式選出該案所需人數之候選國民法官,並為必要之調查,以審核其有無不具第十二條第一項所定資格,或有第十三條至第十五條所定情形而應予除名。
前項情形,如候選國民法官不足該案所需人數,法院應依前項規定抽選審核補足之。

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