Flax　fibers　have　been　widely　used　as　reinforcing　materials　due　to　the　growing　demand　for　the　development　of　sustainable　materials.　They　are　cost-effective　and　have　excellent　mechanical　properties.　In　this　study,　the　dynamic　tensile　properties　of　flax　FRP　coupons　were　tested　using　an　Instron　VHS　high　rate　testing　system.　The　effect　of　strain　rate　on　the　failure　process,　failure　modes,　tensile　strength,　failure　strain,　and　Young’s　modulus　of　flax　FRP　coupons　were　discussed　and　analyzed　within　the　strain　rate　less　than　164.2 s−1.　The　failure　process　at　different　strain　rates　were　captured　by　a　high-speed　camera.　It　was　observed　that　the　specimen　failed　with　only　one　cross-sectional　fracture　at　a　relatively　low　strain　rate.　At　a　relatively　high　strain　rate,　more　than　one　fracture　was　observed.　The　experimental　results　indicated　that　the　dynamic　tensile　strength　increased,　failure　strain　decreased,　and　Young’s　modulus　remained　almost　unchanged　when　the　strain　rate　was　less　than　41.3 s−1.　As　it　was　over　41.3 s−1,　the　dynamic　tensile　strength,　failure　strain,　and　Young’s　modulus　had　a　prominent　rise.　To　describe　the　dynamic　tensile　strength,　failure　strain,　and　Young’s　modulus　at　a　certain　strain　rate,　empirical　equations　based　on　the　experimental　data　were　proposed　for　reference.　©　The　Author(s)　2024.