Abstract: Based on the temporal characteristics of experimental courses,this study analyzes the current situation in which experimental courses are predominantly offered in the third academic year.An optimization strategy of "front-back articulation and vertical coordination" is proposed.A three-stage progressive instructional system is constructed,consisting of basic skills training,comprehensive application,and research and innovation development levels.The barriers between experimental courses across semesters are removed,and cross-course integrative experimental projects are designed.Practice results demonstrate that the temporally coordinated experimental teaching system effectively enhances students' comprehensive practical abilities,stimulates their research interest and innovative potential,and promotes the systematic integration of teaching resources as well as improvements in teaching efficiency.