In order to study the methods and effects of gastrohelcovsis treated by Nd:YAG laser between 1997 to 1998. The Nd:YAG laser were led into the ulcer lesion through the gastroscope directly. Nd: YAG laser exposure power was 50W. The times of irradiaion were various according to the area whether large or small of the ulcer. 8 of the 32 cases were one single ulcer lesion. 24 of the 32 cases were multiple ulcer lesions. The results of the study indicated that the rate of healing was 100%. No side effect or complication was found in the study 26 of 32 cases were not observed recurrence ulcer after one year.