If it is a CAD drawing, there are two ways to sign it, one is to insert a picture, and the other is to use software, such as Peng's signature software, to sign it directly electronically.

The construction unit shall make records after sorting out all drawing problems, and hold a meeting of the blue prints.the design. The owner, design unit and construction unit * * * will study and improve the problems and deficiencies in the drawings, discuss the suggestions put forward by the construction unit, and record the final scheme in the record form of the blue prints.the design, which will be signed by the representatives of the three parties, and fill in the confirmation form of the blue prints.the design as the basis for the construction and settlement of the construction unit.