Carbon cluster ions have been produced by laser ablation and stored in a RF ion trap. Taking the advantage of mass selective storage and long storage time of the ion trap, we have studied the collision induced dissociations and collision association reactions of C + n cluster ions through the mass selective storage in the ion trap. According to the findings of collision induced dissociations and the variations of enthalpy before and after collisions, the conditions that collision-induced-dissociations can happen to cluster ions are obtained. And, the range of endotherm and the dependence of collosion -induced activations on trapping parameters of cluster ions are analyzed. Based on the analyses, the processes of association reaction of ions produced through collision参考文献-induced-dissociations of cluster ions are rurther studied. The method of calculation of effective collision cross section is also investigated.