Background: As online healthcare is to support aging for reducing health cost and offer sustainable solutions, it is important to develop fundamental knowledge on what causes the usage intention for online healthcare among older persons. However, information about the technology-specific predictors of the willingness to use online healthcare remains scare. The goal of this study is to better observe whether technology-based factors are associated with the intention of using online healthcare. Methods: In the current study, we conducted a cross-sectional survey in 2023 in Chongqing city of Western China, and 403 urban older adults aged 60 and above were enrolled. Results: We found that technology-specific factors including perceived risk (B = -0.100, p < 0.001), perceived benefit (B = 0.209, p < 0.001), relative advantage (B = 0.261, p < 0.001) and compatibility (B = 0.274, p < 0.001) were significantly linked to the usage intention for online healthcare. Additionally, financial strain status of perceived difficult (B = -1.024, p = 0.019) was negatively related to the usage intention for online healthcare. Conclusions: The results of this study identify the four technology-specific factors including perceived risk, perceived benefit, relative advantage and compatibility that have a strong influence on the usage intention for online healthcare. This influence implies that the technology-based factors are the key elements affecting older individuals’ perceptions, values, needs, preferences, experience and lifestyles in response to digital health technology. In addition, the results of this paper confirm that the attributes of relative advantage, compatibility and perceived benefit could act as facilitator and perceived risk as a barrier to the usage intention for online healthcare. Findings also enrich the applicable case of the diffusion of innovations theory and the benefit-risk analysis model in understanding the usage intention for online healthcare. Moreover, these findings and their implications here could provide specific evidence that the reinforcement of the usage intention for online healthcare in everyday life depends on technology-based factors in the Chinese context. The theoretical mechanisms underlying the link between the usage intention and technology-specific factors can also aid in developing and implementing sustainable technology-based solutions for online healthcare among older adults.