In recent years, public museums in Taiwan have been facing strong competition and operational challenges. Restricted by legalities and regulations, it seems much more difficult for public museums to secure support such as funding and personnel than private ones. With the mission of public service and social education, public museums should regard human resources as "their core of operation", and consequently human resources development should be employed to create and develop the best opportunities for the museum. Internal marketing, often related to management and human resources, can promote staff service quality and job satisfaction, as has been proven by empirical studies. This paper aims to discuss how internal marketing can be integrated into human resources development in public museums by adopting the marketing mix. Finally, an application pattern is constructed and suggestions are put forward.