For controlling the highway environment risk impact on urban and rural source of drinking water, pile K5+374 is taken as an example. It is an environmental engineering in drinking water protectionarea at the final completion and acceptance stage of the road engineering of secondary highway from Hengxian County to Binyang In this case, drinking water source risk prevention and environmental protection design and investment costs in bridge engineering are illustrated, and the effectiveness is analyzed at the meantime, aiming at providing reference and guidance to similar bridge project environmental impact assessment, environmental design and acceptance.