This test was conducted to evaluate the effects of garlic and Capsicum in compound on performance, serum biochemical indexes and egg quality of laying hens in summer. A total of six hundred 31-week-old healthy Suqin green eggshell laying hens were divided into 10 groups (with 4 replicates per group and 15 hens per replicate), and fed 10 kinds of diets, respectively: 9 experimental diets were composed of basal diet and additives compounding with garlic, Capsicum, oligosaccharide, Bacillus subtilis and citric acid. The garlic (2.50, 5.00 and 7.50 g/kg) and Capsicum dosages (1.50, 2.00 and 2.50 g/kg) were 3×3 factors designed. Diet of control group did not contain garlic and Capsicum, and the other component were the same as experimental diet.The pre-test lasted for 1 week, and formal test lasted for 6 weeks. The results showed as follows: 1) the dosages of garlic and Capsicum did not significantly affect the final body weight, laying rate and average daily total egg weight (P>0.05), but they had significant effects on the feed intake and the ratio of feed to egg (P<0.05 or P<0.01). The dosages of garlic and Capsicum had significant interaction effects on the final body weight, the average egg weight, feed intake, the ratio of feed to egg and average daily total egg weight (P<0.05 or P<0.01). 2) Garlic dosage significantly affected creatine kinase activity, but dosages of garlic and Capsicum had no significant interaction effects on the activities of lactate dehydrogenase and creatine kinase (P>0.05). Garlic dosage significantly affected on phosphorus ion concentration (P<0.05), but it had no significant effects on potassium, sodium, chlorine and calcium ion concentrations (P>0.05). 3) Garlic dosage significantly affected eggshell strength (P<0.05), and Capsicum dosage had a significant effect on egg yolk color (P<0.01), but they did not significantly affect other egg quality indexes (P>0.05). The dosages of garlic and Capsicum had a significant interaction effect on egg yolk color (P<0.05). In conclusion, the appropriate dosages of garlic and Capsicum in diets can improve the performance, egg quality and the ability of resist heat stress of Suqin green eggshell laying hens in summer.