Objective:To observe the effects of six-word common health Qigong on the electroencephalogram(EEG) of patients with mild cognitive impairment. Methods60 patients with mild cognitive impairment(MCI)were randomly divided into the treatment group and control group,30 cases in each group. The patients in the treatment group taken the six-word common health Qigong exercises for 3 months,and the patients in the control group did not take exercise. Before exercise,after exercise for one and three months,the changes on the score of mini mental state examination(MMSE)scale and the EEG in task state were detected.  Results:①In both groups,there was no statistically significant difference on the MMSE score between the treatment before and after exercise for one month(P>0.05). In the treatment group,there was statistically significant difference on the MMSE score between the treatment before and after exercise for three months(P<0.05). After exercise for three months,there was statistically significant difference on the MMSE score between the two groups,and the score of the treatment group was obviously higher than that of the control group(P<0.05).②For the comparison between the treatment before and after exercise for one month,the difference on the approximate entropy of EEG was not statistically significant in the control group(P>0.05). Compared with treatment before,the EEG approximate entropy was obviously decreased in the treatment group after exercise for one month(P<0.05)；and the EEG approximate entropy was obviously decreased in the treatment group after exercise for three months(P<0.05). After exercise for one month,the EEG approximate entropy in the treatment group was obviously lower than that in the control group(P<0.05). After exercise for three months,there was statistically significant difference on the EEG approximate entropy between the two groups,and the EEG approximate entropy in the treatment group was obviously lower than that in the control group(P<0.05).③For the comparison between the treatment before and after exercise for one month,the difference on the LZ complexity of electroencephalogram was not statistically significant in the control group(P>0.05). Compared with treatment before,the LZ complexity of electroencephalogram was obviously decreased in the treatment group after exercise for one month(P<0.05)；and the LZ complexity of electroencephalogram was obviously decreased in the treatment group after exercise for three months(P<0.05). After exercise for one month,the LZ complexity of electroencephalogram in the treatment group was obviously lower than that in the control group(P<0.05). After exercise for three months,there was statistically significant difference on the LZ complexity of electroencephalogram between the two groups,and the LZ complexity of electroencephalogram in the treatment group was obviously lower than that in the control group(P<0.05).  Conclusion:The six-word common health Qigong can significantly delay the disease progression of patients with mild cognitive impairment and improve the memory. Its positive effect on brain function can be objectively proved by some indicators(approximate entropy and LZ complexity)in the electroencephalogram.