Abstract The special internet organization of small and medium enterprise administrations in Taiwan is famous in this world. Interaction in each other is the main factor to conduct such a relationship. From observing the boss of small enterprise administrations, we saw that when small and medium enterprise administrations in Taiwan face inconstant environment, they set up internet organization for survival. The agility and flexibility they showed have competition advantage against big business. At present, various work fields get their necessary materials by authorizing others and it became the main flow for development. In such tendency, for these enterprise administrations, how to built good interaction with authorized factories and create better competition advantage are problems they think about. Most inland boiler business existed as small enterprise administrations. The development of their relationship from how knowing each other till broken relationship, all cooperative conditions included in such relationship are the topic in this study. This study chose 5 bosses working in boiler for more than 15 years as our interviewers. The topic was interaction between boiler business and authorized factories. We processed deep interview to these interviewers by structural outline. We discussed the results by dividing the content of interview into four steps. The symptoms and problems at every step were analyzed since they are knowing each other, cooperation, maintaining relationship till breaking relationship. 1. Knowing each other: when they didn't know each other, they would give the first trust to subjects by vectors, such as friendship, consanguinity, etc. 2.Cooperation: according the interview results, the cooperative styles are divided into three parts, (1) market style, (2) team style, (3) project united style. 3. Maintaining and development: maintaining relationship was across social activities. Utilizing general activities could get rest time and improve relationship. 4.Breaking: trust was the first for cooperation. When doubting or finding subjects not following rules or invading private benefit, trust danger appeared because of broken benefit cooperation. It was the main factor causing such broken relationship.