The rise of mobile payments and online shopping in an era based on advanced internet technology has provided a lot of convenience to the public, however how the relationship between the two develops determines the socio-economic and development level. This article will focus on the interplay between mobile payments and online shopping, analysing and defining each of them. In examining the relationship and impact of the two, this article uses a qualitative research method using questionnaires to investigate payment penetration, user size, purchase patterns, and reasons for mobile payments and online shopping. The study provides insight into the pros and cons of the two, and the corresponding relationship between the outputs. The result is that mobile payments and online shopping in China are interactive and complementary. This paper obtains empirical results from the study that mobile payments should be combined with online shopping, and that in the future, both will work together to overcome online challenges to better develop.