After seeing off passengers to the airport, taxis face two decisions: directly returning to the urban area or waiting for passengers to return to the urban area. In order to study which decision is more beneficial to drivers, this paper analyzes the mechanism of taxi drivers' time cost and profit after adopting two different decisions at the first place. Secondly, this paper determines the expected waiting time of taxi drivers under different conditions through queuing theory. After comprehensively considering the waiting time to determine the total time cost, this paper finally selects the scheme with the highest income per unit time