This study aimed to explore the effects of the application of organic liquid fertilizer on the soil aggregates and the distribution of organic carbon in the navel orange orchard and provide basis for the organic fertilizer application technology. The organic liquid fertilizer irrigation and fertilization experiments was carried out under field conditions，4 treatments were set up:no fertilization (CK)，single application of chemical fertilizer solution (T1)，single application of vegetal organic liquid fertilizer (T2)，50% chemical fertilizer N+50% vegetal organic liquid fertilizer N (T3).Each treatment had six replicates，fertilizer was applied with irrigation with the same amount fertilizer for each treatment and each time every 10～15 days from April to October.After continuous experiment for 2 years，soil samples of 0～15 cm soil layer were collected to determinate the soil aggregates and the content of organic carbon in all sizes of soil aggregate.The influence of the fertilization mode of organic fertilizer on the composition of soil mechanical stable aggregates and water stable aggregates，aggregate stability，the organic carbon content of soil aggregates and its contribution rate were studied. The results showed that，compared with T1，T2 and T3 treatments significantly increased the content of soil >0.25 mm mechanical stable aggregates and water stable aggregates，in which the mechanical stable aggregates increased by 13.57% and 11.87%，respectively，while the water stable aggregates had no significant difference.The mean mass diameter (MWD) and geometric mean diameter (GMD) of mechanical stable aggregates in T2 and T3 treatments were significantly increased by 21.15%，15.38% and 33.85%，29.23% compared with T1 treatment，respectively，while there was no significant difference in MWD and GMD of water stable aggregates in T1，T2 and T3 treatments.At the same time，T2 and T3 treatments optimized the content and distribution of soil aggregate organic carbon，and significantly increased the content of total organic carbon and large aggregate (>0.25 mm) organic carbon.Correlation analysis showed that MWD，GMD and >0.25 mm aggregate contents were linear positively correlated，fractal dimension and >0.25 mm aggregate content were linear negatively correlated.MWD and GMD of aggregates were significantly positively correlated with the organic carbon content of aggregates >2 mm.Therefore，the application of organic liquid fertilizer promoted the formation of soil macro aggregates，improved the stability of soil structure，and increased the content of total organic carbon and macro aggregate organic carbon.