Jaw's harp is an important asset which functions as a message conveyer and affection expression in the past for indigenous Truku people in Taiwan. However, as the old generation gradually passes away, preserving this traditional musical instrument appears to be a more challenging and urgent task for the young generation. On the other hand, Digital Archives has become increasingly common in this era of science and technology that provides online access to archived digital datasets and documents in a systematic fashion. Therefore, in this study we employ Digital Archives as an approach to increase student's self-efficacy of making jaw harps, and to investigate the effect of the above approach. For this purpose a Web-based Traditional Instruments Workshops (WTIW) was designed for and implemented in a practicum course of making Taiwan indigenous Truku people's jaw's harp. The majority of participants possessed positive attitude and gave assurance to the teaching environment of WTIW. Therefore, digital archive appears to be an appropriate method to promote students' motivation to learn musical instruments making; thus, it contributes positively of preserving and inheriting indigenous jaw's harp culture.