Two cases of infantile solitary nonparasitic cyst of the liver caused by slight contusion were experienced. These cases showed a similar clinical course with symptoms including enlargement of the liver, abdominal pain, and anemia that probably resulted from intracystic hemorrhage. Abdominal echo examination and CT scanning were found effective for the diagnosis of this diseases. As treatment, it is advisable to first administer conservative treatment for improvement of anemia and inflammation and then perform operation. The surgical treatment should be selected so as to preclude recurrence and entail as little invasion as possible. Partial excision of the liver cyst combined with fenestration seemed to be the safest and most effective procedure.