The search for emerging technologies is important for science and technology policy. Early detection of emerging technologies makes R&D strategy setting possible. In this study, we suggest the methodology to search emerging technologies by the knowledge mapping method. We examine the highly cited papers in SCOPUS publication DB from 2005 to 2009. We also examine the characteristics of some interdisciplinary research fields by knowledge mapping. Knowledge mapping is conducted based on social network analysis method using keywords in publications. We expect this knowledge mapping will be a helpful methodology for emerging technology detection and examination of interdisciplinary research fields.