Based on the principle of result oriented，Public view and Policy oriented，the index system of assessing online openness of government affairs was constructed. The quantitative evaluation on the online openness of government affairs from 104 county governments was made according to the index system. Results show that in 2018，the average score of online openness of government affairs from 104 county governments in Henan Province was 62.6 points which is slightly more than last year，top five scores are Ruzhou，Dengfeng，Tangyin，Neihuang，Zhongmu，Yongcheng and Huaibin，bottom five scores are Wenxian，Fanxian，Yucheng，Xihua and Huaiyang. Compared with 2017，Minquan，Neihuang and Taikang counties saw the most improvement in their rankings in 2018，while Fan，Luanchuan and Puyang counties saw the most declines. The same index system was used to 18 Municipal Governments of Henan，the results showed that in 2018，the average score of the online openness of government affairs in Henan’s 18 Municipal Governments was 80.8 points，which is slightly more than last year，the top five scores are Zhengzhou，Luoyang，Zhumadian，Xuchang and Nanyang，the bottom five scores are Zhoukou，Jiaozuo，Anyang，Sanmenxia and Xinxiang. In 2018，Zhengzhou continued to rank first in terms of public administration scores，with a relatively stable position. Jiaozuo City retreated from the seventh in 2017 to the seventeenth this year，with the most obvious retreat.