A method for forming an integrated device includes following operations. A first circuit is provided. The first circuit has a first connecting path, a plurality of second connecting paths, and a third connecting path. The plurality of second connecting paths are electrically connected to a first connecting portion of the first connecting path. The third connecting path is electrically coupled to a second connecting portion of the first connecting path. An electromigration (EM) data of the first connecting path is analyzed to determine if a third connecting portion between the first connecting portion and the second connecting portion induces EM phenomenon. The first circuit is modified for generating a second circuit when the third connecting portion induces EM phenomenon. The integrated device according to the second circuit is generated.