英文摘要:The preservation and maintenance of monuments in Taiwan have emphasized on education about the history of monuments, improving the research quality, establishing administrative system, training craftsman of traditional techniques, strengthening the routine management and maintenance, disaster prevent concepts, modern technology application, and reuse of the monuments, and fruitful results have been achieved. However, no clear specifications have been made on the discovery of historical materials in the works of monuments restoration, thus, the consequences include lack of knowledge, or intentional retaining after accidental discovering because of fearing the discovery may bring problems and modification of the design. It is indeed a serious loss to the historical exploration of the monument restoration. Therefore, this paper discusses the discovery of the historical materials of monument restoration and its importance to the historical materials. After reviewing cases on monument restorations reported worldwide, personal opinions are proposed. The research methods include review of literatures, academic publications, restoration reports, and case studies, in order to analyze the discovery, content and types of historical materials from monument restoration. The field investigation and case studies included Tainan San-Sun Kings Temple and Fort An-Ping, and examples are given on the high sensitivity required before the clean-up and professional judgment after the clean-up. Using literature review, field investigation, review of historical materials, and composite analysis, this study establish systematic tool theory for reference to discovering procedures, construction method, and judgment of historical materials, so as to gain better judgment and control over the historical materials on monument restoration. Keywords: Tainan San-Sun Kings Temple, Fort An-Ping,