Abstract: The massive open online course, also known as MOOC, is currently one of the most important online learning platforms in China. The assessment system is an important part of MOOC platform, and also a digital method of teaching quality evaluation for online courses. The MOOC teaching team of Plant Physiology attaches great importance to the design and layout of the assessment system in the construction and operation of the course. So, some experience has been accumulated during the construction and operation of the five aspects of the quiz, test, homework, discussion and examination, which effectively guarantees the assessment of students′ online learning. However, there are still some problems and drawbacks in the system, such as the lack of classroom test function, the phenomenon of replicating answers, and the poor interaction effect in the forum. The above problems can be effectively solved by optimizing the organizational form of the test, upgrading the web page code and the mobile terminal APP program, and modifying the replies of the authority of the students in the teacher′s answer area. This study can not only deepen the research on the reform of the MOOC of Plant Physiology, but also provide practical experience for the stable and effective operation of the other MOOC course assessment system.

Key words: massive open online course, assessment system, test, homework, discussion area