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辽东半岛北纬40°区域，是大连市的重要水资源地．该区域水资源的利用程度，直接影响着大连市社会经济的发展．为此，分析了该区域的降水、径流、蒸发等水文特性，以利于水资源的更好开发和利用．降水量特性为：年内主要集中在6～9月，年际变化较明显，地域分布自东向西递减．径流量特性为：年内分配集中在6～9月，年际变化相当明显，地域分布自东向西．蒸发量特性为：多年平均700～900mm，东、西部偏大．
Liaodong Peninsula latitude 40 ° area, is an important water resources in Dalian. The utilization of water resources in the region directly affects the social and economic development of Dalian. Therefore, the hydrological characteristics of precipitation, runoff and evaporation in this area are analyzed to facilitate the better development and utilization of water resources. Precipitation characteristics are as follows: During the year, it mainly concentrated in June-September, and the interannual variation was more obvious with the geographical distribution decreasing from east to west. The characteristics of runoff are as follows: During the year, the distribution is concentrated from June to September. The interannual variation is quite obvious and the geographical distribution is from east to west. Evaporation characteristics: for many years an average of 700 ~ 900mm, east, west is too large.