介绍了常出现的承包商索赔事件，各种索赔事件所占比例，及监理工程师在索赔事件中应承担的工作和主要职责．以波罗水电站和紫马水电站为例分别说明了承包商索赔和业主索赔的条件． Introduced the frequent contractor claim incident, the proportion of various claims incidents, and supervision engineers in the claim incident should be the work and main responsibilities. Taking Baltic Hydropower Station and Zi Ma Hydropower Station as examples, the conditions of the contractor’s claim and the owner’s claim are described respectively.