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Based on the institutional theory, this paper intends to clarify the relationship of institutional pressures, top management and m-commerce adoption intention in organizations. Using the data from 204 small and medium-sized enterprises in China, we examined the effect of mimetic, coercive and normative pressures on top management support and M-commerce adoption intention. The empirical result shows that: top management support and three types of institutional pressures could positively act on the adoption intention of M-commerce in organizations; top management support partly mediates the influence of two institutional pressures (coercive pressures and normative pressures) on the adoption intention of m-commerce. Implications of these findings for research and practice are discussed.