Abstract: In order to explore the new application of biowastes, husk of Xanthoceras sorbifolia, concentrated 2-ketoLgulonic acid residual solution, and fermented wastewater of pleuromutilin were adopted as ameliorants to improve the soil properties of coastal salinealkali land in Liaohe River delta. The effects of these three biowastes on the salinealkali soil were studied to obtain the best combination by three-factor and threelevel orthogonal variance analysis. Results showed that all of these three biowastes could improve the saline-alkali soil properties at different degrees. Using 0 kg·m^-2 husk of X. sorbifolia, concentrated gulonic acid residual solution twice (80 mL·time-1) and fermented wastewater of pleuromutilin three times (400 mL·time^-1) could significantly decrease pH and ESP of the salinealkali soil. Using 2.5 kg·m^-2 husk of X. sorbifolia could significantly decrease the content of soluble salt, and applying 5 kg·m^-2 husk of X. sorbifolia, fermented wastewater of pleuromutilin three times could significantly improve the soil nutritional condition. Increased soil contents of total phosphorus, available phosphorus and available potassium were observed in the treatment of concentrated gulonic acid residual solution three times. Based on the influence of the biowastes on soil indicators and economic benefits, the optimal combination to improve the coastal salinealkali soil was 2.5 kg·m^-2 husk of X. sorbifolia, concentrated gulonic acid residual solution twice and fermented wastewater of pleuromutilin three times.