The paper introduces the optimal design of the second grade level net in fuoshan , expounds the evaluating method on accuracy for different net pattern based on the principle of indirect balancing and the computing function of the excel matrix , and selects a pattern which meets the needs of national norm for net form , the density of point , accuracy and reliability 摘要本文介绍了佛山市二等水准网项目的优化设计，重点阐述了根据间接平差原理对不同的布网方案，利用excel的矩阵计算功能实现精度评估的方法，评选出一套从网形、点位密度、精度、可靠性等方面都符合国家规范和佛山特点的方案，以供参考。
The paper defines the objective function as : minimizing the quantity of works under the condition of enough water area and depth according with the national codes . the paper narrates the development and main technology of ga , and changes the above problem with restraint conditions into the maximizing problem without restraint conditions , the way the paper chooses is the punish function method 本文对港口堤防布置这一工程优化问题进行了目标函数的确定，并将其描述为:在波高满足泊稳条件、水深及水域面积满足国家规范规定航行与停泊条件的前提下，使堤防工程量达到最小。
Hrb400 steel bars , the 400 mpa hot rolled steel bar , which is called new grade iii steel bar , has been taken as the one of 10 new technical spreading the application mainly , listed in revised newly code , so spread application as leading steel bar in reinforced concrete structure . in 1998 , it ' s pointed new grade iii steel bar is a new type building steel used specially in building structure Hrb400级钢筋(热轧带肋新级钢筋)已作为高效钢筋被列为重点推广应用的建筑业10项新技术之一，早在1998年建设部就明确提出： “新级钢筋是专门为建筑结构应用开发的新型钢筋，该钢种已列入新修订的国家规范标准，应大力推广使之成为我国钢筋混凝土结构的主导钢筋” (建设部建[ 1998 ] 200号文) 。
