Service Innovation for the purpose of raising service quality and service productivity has been moving toward the center of business transformation in knowledge-based economy. To accelerate the growth of service innovation, an overall picture of how service innovation has been developed should be provided to contribute to this field. To obtain the above research purpose, this study proposes a way of mapping service innovation research structure by quantitatively analyzing service innovation research papers retrieved from Web of Science database. A total of 224 papers are retrieved in this study and 160 papers which contain keywords are chosen for research structure visualization. Service innovation research networks are quantitatively investigated by combining network theory and keyword co-occurrence. Contour maps of service innovation are also created on the basis of networks for visualization.