The field of educational research is a primary field for the application of mixed methods research.Traditionally,researchers have placed more emphasis on the superposition of methods(1+1=2)when applying mixed methods in research.However,with the continuous advancement of practice,there is an increasing emphasis on integrating quantitative and qualitative research in the same study to make them mutually beneficial(1+1=3).In practical application,the binary separation in mixed method practice should be overcome,and collaboration should be achieved at every step of the research process(both 1+1=3 and 1+1=1).The mixing in mixed method research is not only a technical mixing,but also a mixing of philosophical assumptions,research processes,and overall research design.To achieve 1+1=1 on the basis of 1+1=3,special attention should be paid to the following five elements when applying mixed methods in educational research:what is the purpose of applying mixed methods,how to consider the position of theory in mixed method research,how to consider time sequence when conducting specific research design,what integration points are there in the research process,and what overall design can be selected when conducting research work.Local education researchers should clearly explain the elements of purpose,theoretical drive,and timing when applying mixed methods for research,attempt to explore multi-purpose design,attach importance to theoretical production,actively explore multiple temporal combinations,and focus on multi-point integration.