Abstract: In this study, the effects of potassium (K) management on the accumulation, distribution, and remobilization characteristics of K and the K utilization efficiency of rice under different light conditions was investigated by using F you 498 as material. The results showed that the accumulation, distribution, and remobilization characteristics of K in rice were collectively influenced by light condition and K management. Compared with natural light, low light stress significantly increased the K content of shoot at 20 days after heading and at maturity, and the accumulation amount and distribution ratio of K in the top-three leaves, as well as the remobilization contribution rate of K in the stem-sheath. Meanwhile, low light stress significantly decreased the remobilization amount and rate of K and the remobilization contribution rate of K in the leaves, as well as the accumulation amount of K in other stem-sheaths and panicles. This resulted in an 18.7%−25.1% significant decrease in partial factor productivity of K in both years. Compared to no K treatment, the application of K significantly increased the K content of rice organs, the distribution ratio of K in the panicle, and the remobilization amount and rate of K in leaves and stem-sheaths, which contributed to a 42.8%-76.6% significant increase in K accumulation amount of shoot at maturity. Compared to 90 kg hm^-2 K₂O respective using as basal (K90-0) and as panicle (K0-09) fertilizers, 180 kg hm^-2 K₂O equally divided as basal and panicle fertilizers (K90-90) increased the K accumulation amount of top three leaves, panicles, and shoot by 7.9%−27.4%, 3.2%−25.5%, and 7.7%−24.8% respectively. In addition, K0-90 treatment increased the remobilization amount and rate of K in leaves and stem-sheaths, which contributed to 1.1%−2.1%, 18.8%−20.7%, and 9.4%−63.1% increase in the partial factor productivity, agronomic use efficiency, and physiological use efficiency of K under low light stress, while compared to K90-0. Correlation analysis revealed that rice yield was significantly and positively related to the K accumulation amount of leaves and the K distribution ratio of leaves and panicles at maturity stage, the harvest index of K, and the remobilization amount and rate of K and remobilization contribution rate of K in stem-sheaths under low light condition. Meanwhile, rice yield was significantly and negatively associated with the K distribution ratio of stem-sheaths at maturity and recovery efficiency of K under low light condition. In conclusion, low light stress effectively improved the K content of rice organs and inhibited the remobilization of K in leaves, which led to a reduction in the accumulation amount of K in panicles at maturity and the partial factor productivity of K. Meanwhile, the application of K fertilizer, particularly the panicle K application could promote the remobilization of K in leaves and stem-sheaths, thereby enhancing the use efficiency of K under low light stress.