Most of online entrepreneurs in Indonesia are women, but their capabilities as professional online entrepreneurs are still less superior. This study aimed to investigate the core competencies of online women entrepreneur and verify the effects on their business performance. The study uses two stages of research: explanatory and confirmatory research. The result of explanatory research, has identified two capabilities as a core competency in building superior online business, i.e. partnership development and digital marketing capability. Yet, by confirmatory research, the study has found that both strategies had significant effects on building a superior business. This model can be also adopted by other online entrepreneurs to build their success in online business.