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This paper presents a pre-procedure to detect and identify gross errors including topology errors for state estimation in smart grid. This pre-procedure is characterized to be fast The key idea behind the procedure is the concept of a solving path, which avoids the chance of divergence when calculating system states using all the measurments in traditional state estimation algorithms. An integer linear programming (ILP) formulation is used to select the solving paths. After a solving path is identified, an error analysis procedure (immune to topology errors) is developed to detect, identify and eliminate gross measurement errors. The subsequent measurement set is used as input to the weighted least squares (WLS) state estimation. The proposed approach is illustrated on the IEEE 14 and 118 bus test systems.