In the post epidemic era, blended teaching has become the mainstream of teaching research and practice. Based on the reflection and analysis of the current blended teaching, the blended teaching practice of soil mechanics and engineering geology was carried out under the guidance of constructivism learning theory. Teaching research was performed from the following aspects:analysis of learning situation to clarify teaching objectives; design of blended teaching to improve the construction of teaching resources; teaching design in classroom to implement multi type teaching mode; design of the course assessment to realize the combination of process and termination; teaching evaluation to obtain feedback, analysis and adjustment of teaching status; teaching reflection to change immediately and form a good teaching closed loop.