During the river closure,apart from those regular hydrologic factors,dynamic variation of the multi-dimensional hydrologic factors in time and space near the closure gaps and open diversion channel were required to be monitored.So,the later research results of related technologies and some advanced experience,mature techniques and equipment in this field should be used as far as possible.The indoors and outdoors experiment and field calibrations relative to several key techniques in the monitoring,which include flow measurement with ADCP,hydrometry at the gaps,GPS application and data transmission,are presented in this paper.It is proven that the researches and applications of these techniques have contributed a lot to the hydrologic and sediment monitoring of the river closure.