In view of the intuitionistic fuzzy number problem with the density preference of information distribution, an intuitionistic fuzzy number aggregation method based on density operator is proposed. Firstly, an intuitionistic fuzzy clustering method based on tree graph is presented, and the distance measure formula is constructed by using the difference together with the similarity. Then the relation betweer the decision make's preference and the density weighted vector is discussed. The two novel operators are defined, namely, the intuitionstic fuzzy density weighted average(IFDWA$_{w,\xi