Code of Civil Procedure Article 359

The authenticity of a document may be proved by comparing the handwriting or the impression of seals.The court may order the parties or a third person to produce documents which may be used for making the comparison.The provisions regarding inspection shall apply to any comparison of handwriting or seal impressions.
中文原文 民事訴訟法第359條
文書之真偽,得依核對筆跡或印跡證之。
法院得命當事人或第三人提出可供核對之文書。
核對筆跡或印跡,適用關於勘驗之規定。

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