There are two leaps for the Qiantang River seawall from soil dike to stonewall and then to standare and Qing dynasties are briefly described and the design, implementation and technical features of standard seawall explained in the paper.

To guarantee quality of the standard seawall project which is characterized with long coast,large quantity and high technology,the headquarters has introduced a new feasible quality control standard and assessment program,to consummate a qualtity administration system and to stress the essential technique training and field administration.

The series of China standard seawater are the national secondary reference mater ial of China [GBW (E) 130011], which is extensively applied in the in-situ ver ification of the salinity or conductivity sensors and the verification or calibr ation of lab salinometer This paper introduced mainly the preparation and unce rtainty analysis of the series of standard seawate