This experiment was conducted to investigate the development and blood parameters of free range barred Luhua laying hens in Sophora japonica grove, and to determine the suitable supplementary feeding level of the free range barred Luhua laying hens in Sophora japonica grove. Two hundred healthy 45-week-old Luhua laying hens with similar laying performance were assigned to 5 groups with 4 replicates in each group and 10 laying hens in each replicate. Birds were put to the Sophora japonica grove for free range rearing, and the supplementary feeding levels were 60%, 70%, 80%, 90% and 100% of free feeding experimental diet, supplementary 100% were fed 90 g/d experimental diet. The pre-experimental period lasted for 7 days, and the experimental period lasted for 70 days. The results showed as follows:1) the laying rate and average egg weight of the supplementary 60% group were significantly lower than those of other groups (P<0.05). 2) There were no significantly differences in egg shape index, eggshell thickness, eggshell strength and ratio of eggshell among all groups (P>0.05). The Haugh unit of supplementary 80%, 90% and 100% groups was significantly higher than that of supplementary 60% and 70% groups (P<0.05), the ratio of yolk of supplementary 70% group was significantly higher than that of supplementary 90% and 100% groups (P<0.05), the yolk color of supplementary 60%, 70% and 80% groups was significantly higher than that of supplementary 90% and 100% groups (P<0.05). 3) The liver index and heart index of supplementary 60% and 70% groups were significantly lower than those of other groups (P<0.05), the gizzard index and cecum index of supplementary 60% and 70% groups were significantly higher than those of other groups (P<0.05), the proventriculus index of supplementary 80% group was significantly higher than that of supplementary 70%, 90% and 100% groups (P<0.05), the oviduct weight of supplementary 80% group was significantly higher than that of supplementary 60% group (P<0.05), the follicle total number of supplementary 80% group was significantly higher than that of supplementary 60% and 70% groups (P<0.05). 4) The serum glucose content of supplementary 60% and 70% groups was significantly lower than that of supplementary 80%, 90% and 100% groups (P<0.05), the serum globulin content of supplementary 60% and 70% groups was significantly higher than that of supplementary 80%, 90% and 100% groups (P<0.05), the blood hemoglobin content of supplementary 80% group was significantly higher than that of supplementary 90% and 100% groups (P<0.05), The blood hematocrit of supplementary 70% group was significantly higher than that of supplementary 80%, 90% and 100% groups (P<0.05). In conclusion, the suitable supplementary feeding level of the free range barred Luhua laying hens in Sophora japonica grove is 70% to 80% of free feeding experimental diet.