Variable　Message　Board　(VMS)　is　an　important　carrier　to　transmit　real-time　road　traffic　information,　but　there　are　still　some　problems　such　as　low　visibility　caused　by　the　overload　of　text　information　on　the　page.　In　this　paper,　the　long　VMS　was　selected　as　the　research　object,　and　the　visual　recognition　time　and　understanding　error　rate　of　42　drivers　under　the　five　kinds　of　text　information　of　8,　12,　16,　20,　24　were　obtained　by　static　cognitive　experiment.　Based　on　descriptive　analysis　and　statistical　test,　the　influence　of　text　information　content　on　drivers＇　visual　characteristics　was　gradually　clarified,　and　the　threshold　of　information　content　was　preliminarily　determined,　and　the　static　cognitive　experimental　results　were　verified　by　dynamic　driving　simulation　experiments.　The　results　show　that　the　information　content　of　VMS　characters　in　long　strip　has　a　significant　impact　on　the　driver＇s　visual　recognition　time　and　understanding　error　rate.　When　the　number　of　characters　exceeds　20　characters,　the　driver＇s　visual　recognition　characteristics　obviously　deteriorate.　©　2022,　Editorial　Department　of　Journal　of　Wuhan　University　of　Technology.　All　right　reserved.