In this paper, it is found that there are errors in D-S combination rules even though the evidences are unconflict. The error, unanti-jamming and opposition during the evidence combination in traditional D-S theory are studied. An effort has been made to prove that the evidence ullage is caused by ill-suited definitions and ill-suited rules in the combination process. In this paper, new generic definitions and combination rules are also proposed. The evidence ullage in the compatible evidence combination process in terms of the definitions and rules is found and then solved. The experimental results show that the methodology developed here can not only solve the conflicts efficiently, but also produce reasonable results.