Knowledge sharing is a kind of risky decision making behavior, and trust has an important function of risk management. Through analysis on the characteristics of the risk of knowledge sharing decision, here it proposes a trust structure model for risk management in knowledge sharing decision making. Based on survey data, it examines the rela- tionships between different dimensions of trust, as well as their impacts on knowledge sharing decision making. The conclusion shows that institution-based trust is the basis of the development of cognition-based trust and affection-based trust, and the a...