Abstract: Hydraulic Concrete Structure online open course consist of course introduction, course teaching units and final examination. The course teaching units are the cores of online open courses, and the micro-courses are the cores and foundation of teaching units. The online open course adopts the evaluation mode of “process+pass”comprehensive assessment. By introducing the online open course construction and operation, analyzing and summarizing the course features and existing problems, it provide the references for constructions of the similar online open courses.