The protection countermeasures for the ecological environment of highway construction project in mountain area are investigated in order to minimize the disadvantageous effects of highways construction on the ecological environment along the line.By taking the Ankang-Hanzhong highway construction project for an example,the effects of each function section in highway construction,such as main work,bridge project,tunnel project,service project,and temporary floor area,on the ecological environment along the line are analyzed,and then the environmental protection countermeasures for the different construction stages,such as designing period,construction period,and operating period,are studied.The environmental protection countermeasures,which are reasonable and feasible in practice,are proposed.A better environmental protection measure system of highways construction project is established.