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In study of corrosion diagnosis on grounding grids, the diagnosis model is complex and the efficiency and the precision of diagnosis is low. To solve these defects, the improved fault diagnosis method is mentioned based on immune genetic algorithm. The grounding grids are torn up into some blocks based on node tearing method, then the blocking multi-objective optimization model is established and the constraint condition is reduced. The diagnosis model is solved by the improved fault diagnosis method. The result of the test is proved that the mentioned method could converge to the optimal solution in the model’s optimized function. the consistency of The branch diagnosis and the actual results is as high as 90%. It could find fault location quickly and accurately, and it enjoys the engineering application value.