The study of suitable harvesting period affected on the increasing fresh weight of Pak Choi (Brassica campestris L. ssp. chinensis), while crude fiber value showed minimum level. . Harvesting period was divided into 3 phases 27, 30 and 33 days after transplanting.. The results found that both weight and fiber all varieties of Pak Choi were not significantly different. However, the fresh weight ranged from ?-? grams per plant. The crude fiber ranged from ?-?. A summary that will be harvested in any harvest age will have the quality and the productivity weight did not differ and to save expense in maintaining productivity thus should be harvested at age 27 days.