For declining business transaction risks which might hinder mutual funds market and to creating market interests, there must being some shape of social capital between investors and funds management company -- especially to trust and reciprocal each other, and interaction will make for establish their relationship. This research analysis by Logistic model, according to Stock Listing in the Taiwan Security Exchange and funds management companies offering mutual funds for 12,809 samples from 2002 to 2004, to examine the effects on direct or oblique interaction relationships for market mutual funds. To observe how social capital will effect upon both funds management companies and investors’ behavior, then to come of how to improve a market way whether the performance will be significant higher. 1. To keep the persistence in performance and reiterate relationships on Taiwan’s mutual funds. As will result trusts between customers and the funds management companies, and then will reduce their sensation to trading risks, even to promote more possibility of marketing. 2. The position on internet will effect market notable, because of customers realize that superior grade position should be trust usually. 3. The relationship on internet could be transferred –funds management companies can transfer their bund debenture foundation to non-debenture. 4. Mutually beneficial relations always exist in between funds management companies and their customers. – That is, take reciprocal action for the institutional investors may exhibit more herding behavior what there are more incentives for the individual investors to herd in their trading.