Abstract: Abstract： The trust relationships between individuals compose complex networks with small-world phenomena，which is the so-called web of trust.Modeling for trust propagation is a fundamental block in many of most successful e-commerce and recommendation systems.By introducing the concept of attribute similarity，a model of trust propagation scheme is developed，which may be expected to be applied into e-business，semantic web，mobile ad hoc networks，etc.Also the recommendatory means to calculate the similarity degree are given.Simulations show that a small number of expressed trusts per individual allow us to predict trust between any two people they never work together before in the system with high accuracy.