Market mechanism is effective to encourage more people to participate in the Grid environment. Applying economic principles to Grid is deemed promising to improve the overall value provided by such participants. However, resource scheduling algorithms are different depending on different needs. In this paper, we mainly focus on the consumers' own interest. Assuming that the consumers are selfish and what they concern about is lower cost and higher success rate, we improve the HRED algorithm using hierarchical mechanism and resource selection mechanism, which cooperate with resource providers' trust degree, making it more suitable, practical and credible for Grid market. The experiments prove that the improved HRED algorithm works faster especially when there are large numbers of resource providers in Grid market, and it also gives much higher success rates in the non-credible Grid environment.