To　improve　the　accuracy　and　reliability　of　the　calculation　of　concrete-formwork　lateral　pressure,　a　series　of　pressure　test　were　carried　out.　The　test　data　and　the　calculated　value　of　different　specifications　were　analyzed　in　the　way　of　comparison.　Then,　a　calculation　model　for　concrete　formwork　lateral　pressure　was　established　based　on　Janssen　theory　and　a　calculation　formula　was　derived.　The　reliability　of　the　formula　was　proved　by　the　experimental　data.　Research　showed　that　there　exist　some　potential　safety　problems　as　well　as　large　dispersion　in　formwork　lateral　pressure　calculated　by　the　current　codes.　The　model　proposed　can　more　accurately　predict　the　lateral　pressure　with　high　reliability　and　lower　dispersion　when　compared　with　the　test　value.　©　2019,　Engineering　Mechanics　Press.　All　right　reserved.