Abstract: Distribution time reliability has become a significant factor affecting urban logistics distribution system ef-ficiency .To scientifically evaluate the distribution time reliability ,based on summarizing and defining the connotation of city logistics distribution time reliability ,the impact factors of distribution time reliability have been revealed by road traf-fic situation ,distribution time windows ,distribution routing and spatial difference of distribution demand .Then ,the e-valuation model of distribution time reliability has been established based on logistics distribution section ,routing and net-work .On this basis ,an optimization model has been established ,whose aim is to maximize the logistics distribution time reliability .Finally ,the optimization strategies have been proposed from arranging distribution time ,choosing distribution route ,optimizing time window and improving logistics information .