| The study area consists of Bohai Sea, northern Yellow Sea and parts of southern Yellow Sea, and it ,lies in eastern of Eurasia Bridge that includes the principal part of economic zone around Bohai Sea. And the position of the study area is between 36?41.5癗 and 117?127癊, whose sea area is 234700km2. The land around the study area includes Shandong, Hebei, Liaoning Province and Tianjin City, and it is one of nine important economic circles that have unique resource and geography superiority in China. But in recent years rapid increase of the population and speedy development of the economy make the environment worsen rapidly in Bohai and Yellow Seas, for example red tides happen frequently. In order to hold out the exacerbation of sea area environment and insure persistent development of the economy around Bohai economic zone, China government has determined that "Blue Sea Action Project inBdhai Sea" has being performed from 2001 to 2015 so as to obtain fresh and beautiful environment in Bohai Sea.The economic status of the study area and the performance of "Blue Sea Action Project in Bohai Sea", "973 Project" and "Three Yellow Rivers Construction Project" show that the study area is very important in the development of China, and the circulation in the study area affects the diffusion of contaminates after entering into the seas, transport'of suspended sediment and occur of red tides, so analysis of the circulation and sedimentation has important practical meanings.The paper collects three parts of data: 1930-2002 temperature and salinity dataprovided by National Oceanographic Data Center of USA, 2000/08-2001/12 NOAA/AVHRR romantic data and 2001/07/-09 sea surface temperature data in three stations provided by related departments of the Station Oceanic Administration of China. According to the analysis of these data and combining the studied results for seabed sediment environment distribution, the paper makes conclusion as follows: 1 The leading dynamical factors dominating the current systems in the study areaare Kuroshio Current and the East Asia Monsoon, so based on the analysis of water mass' temperature and salinity, the paper constructs a simple water mass' intensity exponent and obtains three water mass' intensity borderlines. Namely, the paper computes water mass' intensity of the waters in upper 200m layers in eastern ChinaSea, analyzes the distribution and evolvement of important water mass1 borderlines and indicates monthly variations of primary current systems waters in eastern China Sea. The results indicates that the main current systems are Yellow Sea Warm Current and Coastal Current systems, and according to their temporal and spatial variation we can know the major circulation in study area. Monthly variation of water masses in eastern China Sea is divided into three phases: First, Eastern Asia Winter Monsoon coastal water masses affect intensely from December to April. Second, from May to July is transitional phase, when coastal currents weaken and remain and warm currents strengthen. Third, from August to November belongs to summer process, and the water masses are not stable. The Yellow Sea Coastal Current waters is very important for water mass' evolvement and Yellow Warm Current extending to Yellow Sea.2 The paper analyses fourth and fifth bands data of NOAA/AVHRR and sea surface temperature (SST) data, then gains a SST statistical formula: SST=1. 035T4+3. 046(T4-T5)-287. 97 and SST field and interpretation figures of current systems during typical periods in the study area, then concludes a circulation mode in Yellow and Bohai Seas combining former studies. The study indicates that there are respectively four and three circulation systems in Bohai Sea and northern Yellow Sea. In winter Yellow Sea Warm Current and coastal currents influence each other and develop intensely. But in summer they are weak. These results have correspondence with water mass' intensity computations.3 The paper analyses first and second bands data of NOAA/AVHRR and obtai...
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