Based　on　the　theory　of　inventory　analysis　and　the　emissions　factor　approach,　we　collected　the　carbon　emissions　factors　and　proposed　a　measurement　method　and　evaluation　indicator　for　carbon　emissions　in　the　construction　stage　of　project-level　highways.　The　carbon　emissions　of　a　secondary　highway　project　in　construction　stage　were　calculated,　and　the　composition　of　carbon　emissions　and　carbon　intensity　in　the　construction　stage　were　analyzed　from　two　perspectives.　According　to　the　calculation　results　of　the　instance　project:　(1)　the　construction　period　of　pavement　projects　has　the　largest　proportion　of　carbon　emissions;　(2)　the　construction　stage　carbon　emissions　intensity　per　unit　of　pavement　area　of　bridge　and　tunnel　sections　is　6.1　times　and　5.4　times　that　of　roadbed　sections,　respectively;　and　(3)　carbon　emissions　per　thousand　yuan　investment　are　131　kg　CO(2)e.　Low-carbon-emissions　road　construction　should　start　with　the　selection　of　low-carbon　road　construction　materials　and　reasonable　control　of　the　bridge-tunnel　ratio.