How　to　effectively　and　accurately　evaluate　and　analyze　the　volatility　and　reliability　of　travel　speed　on　urban　road　before　and　after　students　back　to　school　is　a　hot　and　key　problem　in　urban　road　traffic　congestion　governance　research.　The　Beijing　3rd　Ring　Road　was　taken　as　the　research　object　and　the　impacts　of　the　students　back　to　school　on　the　volatility　and　reliability　of　the　travel　speed　of　road　sections　were　qualitatively　and　quantitatively　analyzed　based　on　the　road　section　travel　speed　data　during　the　weekday　morning　peak　(7:00-8:59).　The　results　showed　that　the　travel　speed　of　the　Beijing　3rd　Ring　Road　had　cyclicity,　time　variability,　large-scale　volatility,　and　light　congestion　during　the　weekday　morning　peak,　and　the　volatility　and　reliability　indexes　of　the　travel　speed　of　road　sections　significantly　decreased　under　the　impact　of　the　students　back　to　school.　The　data　showed　that　after　the　students　back　to　school,　the　maximum　reduction　ratio　of　average　travel　speed　was　larger　than　55%,　and　the　maximum　travel　speed　reliability　reduction　value　was　larger　than　0.85　based　on　the　evaluation　model　of　travel　speed　reliability　of　car　commuters.　The　research　results　provide　data　and　theoretical　support　for　urban　road　traffic　congestion　mitigation　and　governance.