Abstract: Scientific data sharing platform is an important supportive infrastructure for scientific data sharing activities，it is not only a platform for integrating data resources and implementing technical standards or management policies but also a window for user services.The main objective of this platform is to drive scientific data resources from producers or holders to end users.After examining focal points in distributed earth system scientific data sharing，authors design a platform software system composed of “one main center，one certification & authentication center and several sub-centers” which forms a “geographically distributed but logically integrated” distributed network.Then，some key techniques are discussed in detail in this paper，i.e.single sign on，information synchronization between data centers，real time decentralized metadata submitting and harvesting and universal data resources access.By using Java EE technology，authors develop the distributed earth system scientific data sharing software.The software can be deployed easily across multi-departments and on different operating systems.Powered by this platform software，the Earth System Scientific Data Sharing Network which composed of one main center and 13 sub-centers is set up，it has provided about 14 TB data services for 33 515 users and 270 national key scientific research programs for free till the time of this writing.