Abstract: The aim was to study effects of different ratios of complex-probiotic-preparation on growth performance, slaughter performance and meat quality of broiler. 360 healthy and 50-day Guangxi Lingshan native chickens with similar body weight were chosen and divided into three groups, and each group had four repeats. Each repeat had 30 chickens （half cock and half hens）. Control group were fed with basal diet, while tested group were fed with tested diet within 0.1% and 0.2% complex-probiotic- preparation, respectively. The test lasted for 70 days. Results showed that, compared with control, adding 0.1% and 0.2% complex-probiotic-preparation could significantly improve average daily gain and survival rate of broiler （P〈0.05）, significantly decreased the ratio of feed to gain （P〈0.05）, significantly improve half net carcass rate and whole net carcass rate （P〈O.05）, significantly decreased percentage of abdominal fat （P〈0.05）, significantly improve crude protein, ash content and inosinic acid （P〈O.05）, and significantly decreased crude fat and cholesterol content of thoracic muscle （P〈0.05）. Therefore, adding different ratios of complex-probiotic-preparation could significantly improve the growth performance, slaughter performance and meat quality of broiler, among them adding 0.1% complex-probiotic-preparation had the best comprehensive effect.