Continual research and improvement on diet formula and process have been made to develop a kind of pellet. Experiment has been done in compa-rison with the German-made pellet with which the examined animal, common marmoset ( CALLITHRIX HACCHUS ) , was fed. The result shows that self-made pellet is better than the German-made one in palatability. The reproductive performance of adult marmosets and the growth performance of infant marmosets are nomal when this kind of self-made pellet is obtained .No bad effets have been found during one years feeding. The self-made pellet contains 3428 cal digestible energy and 112.5 gram digestible crude protein per kilogram. Though the protein content of this self-made pellet is much lower than that of German-made pellet, it is sufficient to meet the needs of marmosets.