Considering the scale of current distribution systems, parallel and distributed computing is addressed. Which parallel technology and architecture to take and how to divide the computing unit are two key issues of distributed computing. A hierarchy of distributed platform is built based on ZeroMQ, which can provide N-N connection by different kinds of socket. To support the parallel computing, a feeder is decomposed into subareas which are area-decoupled, so that we can regard each subarea as an independent estimation unit. At the same time, the branch-current-based method is proposed to estimate the state of each subarea. As the state estimation (SE) of a subarea being a sub-task, we can finally achieve the SE of the whole distribution system. The calculation example shows that with the proposed platform, SE for a 500-node system takes a significant speed advantage than the traditional ones.