Development of the deep manned submersible, "JIAOLONG", is one of the key projects of the national "863" high technology program. Its target is to build a practical product to carry out the predefined missions. Sea trial is the last stage of the development program with higher risks. In the periods from August to October 2009, from May to July 2010 and from July to August 2011, the 1000m, 3000m and 5000m depth class tests were successfully finished respectively. Main purpose of this paper is to introduce the results of 7000m depth class test which was just carried out from June 3 to July 16, 2012 and successfully completed. The contents include a description of basic information on the sea trials, technological and scientific achievements made in the tests, main faults in operation and dispose measure and their implications to future application. Finally, some conclusions are drawn from this sea trial.%蛟龙号载人潜水器研制是国家863计划重大专项之一,其目标是建造出一台可以执行规定使命任务的产品.海上试验是载人潜水器重大专项的关键阶段,2009年8～10月、2010年5～7月和2011年7～8月,分别完成了1000米、3000米和5000米级的海上试验任务.文章主要介绍了在2012年6月3日～7月16日之间完成的7000米级海上试验,内容包括海上试验的基本情况、海试取得的主要技术和应用成果、海试过程中发现的故障及处理情况以及对今后投入应用的启示,最后给出7000米级海上试验的主要结论.
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