Abstract:  To investigate the variations in soil physicochemical properties, crop yields, and energy flow characteristics under diverse paddy-dry cropping patterns. Five treatments were established: Chinese milk vetch-Early rice-Late rice (CK), Chinese milk vetch-Early rice-Corn‖Soybean (MRCB), Rape-Early rice-Corn‖Soybean (RRCB), Rape-Early rice-Late rice (RRR), and Potato-Early rice-Late rice (PRR). Soil physicochemical properties were measured and correlated with crop yields to identify key influencing factors and energy flow characteristics under different cropping patterns. Our results showed that, compared to the CK treatment, the PRR treatment significantly enhanced the soil AK content by roughly 156.71%-300%. The MRCB and RRCB treatments also showed higher AK content than the CK treatment. Notably, the total crop yield of the RRCB treatment was the highest, reaching 45347.94 ± 3099.40 kg·hm^-2. Correlation analysis further indicated a highly significant positive relationship between the total crop yield of the RRCB treatment and the soil AK content. This difference can be attributed to the positive effect of plowing on soil looseness after paddy-dry cropping, which enhances the soil AK content, thereby providing nutrients for crop growth. In terms of energy flow characteristics, the total primary productivity of the RRCB treatment increased by 568.58% compared to the CK treatment. In terms of the energy flow circulation index, the values for MRCB, RRCB, and PRR treatments were found to be 0.247, 0.228, and 0.388 respectively, all of which surpass the CK treatment. Furthermore, the light energy utilization rate was observed to be the highest for the RRCB treatment, registering at a magnitude 2.42 times greater than the CK treatment. Therefore, it can be concluded that the RRCB treatment has the potential to elevate the content of AK, thereby increasing the overall yield.