Abstract: The concept of weighted generalized inverse matrices is described in this paper,It is shown,from the relationship between weighted generalized inverse and solution of linear equations,that three kinds of rank-defect network adjustment(common used rank-defect network adjustment,quasi-stable adjustment,weighted rank-defect network adjustment) all belong to the weighted rank-defect net adjustment.But different weight matrices are selected in them.Therefore,they can all be explicated with weighted generalized inverse.