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The existing grounding grid corrosion diagnosis algorithms have large amount of calculation, they take up lots of time and are inconvenient in the practical application. In this paper, a parallel algorithm based on Local Area Network (LAN) is put forward to solve above problems. The master sub-process sends the samples needed to be calculated to the slave sub-processes on the computers of the LAN. The slave sub-processes calculate the samples at the same time and send the results back to the master sub-process. The final result will be figured out by the master sub-process after all the results being gathered. The parallel algorithms of grounding grids testability evaluation, uncertain branches estimation and monitoring pole allocation optimization are discussed, respectively. An experimental grounding grid with sixty branches is used as an example to validate the proposed parallel algorithms. The test is based on a LAN with five computers. The results show that the proposed methods are feasible and the calculation time can be shortened remarkably.