The invention relates to the field of escherichia coli producing succinic acid through fermentation. Concretely, the invention provides recombinant escherichia coli producing succinic acid. The escherichia coli comprises at least one or more kinds of modification as follows: a) enhancement on activity of gene related in pentose phosphate pathway (PPP); b) enhancement on activity of sthA gene; and c) mutant lpdA gene. The invention also relates to application of the engineered recombinant escherichia coli to product succinic acid, and a method of using the engineered recombinant escherichia coli to product succinic acid.