Abstract:Paddy-upland rotation is a crucial farming system for ensuring grain and oil supply and increasing the multiple cropping index.However, tillage and land preparation operations in these areas are constrained by dry-wet alternation, soil compaction and heavy clay, retained high-moisture straw, narrow turnaround windows, and pressing seasonal schedules, all of which place higher demands on equipment adaptability and reliability.To systematically review the application status of tillage and land preparation technologies and equipment in paddy-upland rotation areas and clarify future research priorities, the regional distribution and cropping patterns of paddy-upland rotation in China were firstly summarized, and then the key technologies and representative equipment for straw management, soil fragmentation, furrow opening and bed-forming, seedbed shaping, and multi-functional combined operations were reviewed.Existing technologies still faced several bottlenecks under dry-wet alternating field conditions, including unclear multiphase coupling mechanisms and limited equipment adaptability, difficulty in coordinating straw management with high-quality seedbed construction, insufficient intelligent perception of the operating environment and weak adaptive parameter regulation, and inadequate understanding of the damage mechanisms of soil-engaging components, which led to low operational reliability.Future research should focus on multi-field coupling simulation and digital twins, structural topology optimization and bionic design, intelligent sensing and precision control, and surface engineering and reliability enhancement of key components.These efforts were expected to provide theoretical support and technical references for developing efficient, low-energy, and intelligent tillage and land preparation systems for paddy-upland rotation areas.