Abstract: Based on the reservoir characteristics analysis of Nanyishan Ⅰ＋Ⅱ shallow reservoirs, this paper analyzes the damage mechanism of the formation. Due to the complexities of physical properties and minerals, the reservoir tends to be damaged. The sensitivity analysis indicates that the reservoir is mainly water sensitivity, salt sensitivity and acid sensitivity, but minor velocity sensitivity. So preventing water sensitivity, salt sensitivity and acid sensitivity during the exploration and exploitation of the reservoir should be taken into consideration first.