A very important reason for low quality results of XML keyword searching is that it is difficult to reflect the user's query intent. In this paper, setting keywords weight could resolve this problem to a certain extent. A new method of query results sort based on keywords weight and keywords structure is proposed. This method sets keywords weight and sets nodes weight for every node that contains keywords, according to keywords weight. The importance of the SLCA node is estimated according to the nodes weight in the relation tree and the relationship between keywords. The query results are sorted on the importance of SLCA nodes. The experimental results show that the proposed method has higher accuracy for sorting.