Agglomeration and building complexes are two mainstreams in modern urban development, planning and construction. The combination of agglomeration theory and building complex theory is proved to be feasible and useful through function analysis of Shanghai Maritime Service Agglomeration (SMSA) area. The findings point out that construction innovation of building complexes should comply with the integral demand of talents, companies and government. In addition to external scale effect, cost reduction, talents attraction and other agglomeration effects, function innovation of SMSA is analyzed and investment is made in four main aspects as comprehensive maritime services, resource & energy saving, environment-friendly & green transformation and environment adaptive yacht harbor operation. The assessment and discussion on the construction project witnessed a great success that social and economic benefits are abundant. The experience of SMSA is summed up to provide theoretical and practical reference for the construction of other building complexes and agglomeration areas.