The sustainability of mangrove forest management was required social capital.  Social capital wassociety capability  to made relation  each other and built the power that very important not only for economic life of the community but also other socialexistantion. This research aimed to know the social economiccharacteristic and social capital communities that managed and conserved the mangrove forest in Labuhan Maringgai district of East Lampung Regency.  The study used quantitative and qualitative analysis.  The method used  descriptive and scoring method. The results showed that social economic characteristic atMargasari village had much in common with the majority of Muara Gading Mas village and the social capital in Margasari dan Muara Gading Mas village community groups was low. Social capital group of mangrove in Margasari and Muara Gading Mas village were (a) group and network was low in 93% and 100%, (b) trust and solidarity was low in 85% and 76%, (c) aspects of collective and cooperative was low in 80% and 94%, (d) information and communications was minimum in 67% and low in 53%, (e) aspects of cohesion and inclusion was low in 63% and 94% and (f) actions of empowerment and political was low in 96% and 100%.  Keywords: social capital, social economic characteristic, mangrove forest, community group