Abstract: In order to explore the high-yield mechanism of deep mechanized application of the slow-release fertilizers, the field experiments were carried out to study effects of deep mechanized application of slow-release fertilizers on physiological characteristics of precision hill-direct-seeding super rice which were Peizataifeng (Super Hybrid Rice) and Yuxiangyouzhan (Super Inbred Rice). Results showed that compared with manual broadcast application of the slow-release fertilizers at the full heading stage and the mature stage, the photosynthetic rate and the chlorophyll content (SPARD value) increased significantly by 22.00%–4.13%, 9.5%–12.37%, 2.74%–4.44% and 6.01%–6.66%, respectively, and the activities of super-oxide dismutase (SOD) and peroxidase (POD) of precision hill-direct-seeding super rice of all treatments (including T1, T2 and T3) for deep mechanized application of the slow-release fertilizers increased significantly, while their malondialdehyde (MDA) content reduced significantly at full heading stage, 15 days after full heading and mature stage. These results indicated that the deep mechanized application of the slow-release fertilizers can promote photosynthesis and resist, then enhance yield of precision hill-direct-seeding super rice.