Impact of Personal Relationship of Inventors on the Partner Selection of Cooperative Technological Innovation - Based on an Analysis of Enterprises in Xi´an High-tech Zone

QAP regression is used to analyse the relations between personal relationship of inventors (i.e. scientists, engineers and other staff who are responsible for the patent) and firm´s relationship of cooperative technological innovation. With different conclusions drawn by previous studies, the paper did not find the persistence of relationship of cooperative technological innovation, i.e. companies are not inclined to cooperate with the previous partners (i.e. the embeddedness is not obvious), but will choose the enterprises where the inventors work who have the personal relationship with the inventors of companies in the current period.