This　paper　investigates　the　proportional-integral　(PI)　boundary　feedback　control　for　freeway　traffic　networks,　where　the　control　and　output　measures　are　located　at　the　boundaries.　The　boundary　conditions　of　the　vehicle　transportation　system　are　subject　to　unknown　constant　disturbances.　Combing　Aw-Rascle　(AR)　traffic　flow　model　and　Riemann　invariants　approach,　we　use　the　integration　of　on-ramp　metering　and　variable　speed　limit　control　as　PI　boundary　controller　to　address　the　issues　of　feedback　stabilization　and　disturbance　rejection.　To　this　end,　we　deduce　the　stabilizing　control　laws　and　propose　the　stability　condition　which　can　extended　to　a　general　class　of　hyperbolic　systems　including　the　freeway　networks.　The　exponential　convergence　of　the　traffic　flow　dynamics　is　achieved　and　validated　with　numerical　simulation.　©　2019　Technical　Committee　on　Control　Theory,　Chinese　Association　of　Automation.