The effectiveness of economic integration depends largely on the manner and extent to which community law regulating economic integration relations is accepted and implemented in member states. Ensuring the effective implementation of Community law in member states is one of the legal challenges faced by African regional economic organizations in achieving their economic integration agendas. As a legal system to adjust the internal and external relations of the EAC，the implementation effect of it in the member states is not successful，mainly because of the absence of provisions in the legal text to identify the supremacy，direct applicability and direct effectiveness of the EAC law. In practice，African member states assert that constitutionalism is above the EAC law，which leads to inconsistency and ineffectiveness in the application of it. This is not conducive to the creation of a stable and equitable framework for a regional community legal system that promotes economic and trade growth.