The　permitted　parameters　are　theoretically　investigated　in　type　I　and　type　II　for　periodically　poled　RbTiOAsO4　(PPRTA)　crystal　based　on　the　quasi-phase　matching　(QPM)　technology.　When　the　type　I　and　type　II　QPM　PPRTA　crystals　pumped　with　1064　nm,　the　acceptance　wavelength　bandwidths　are　0.25　nm/cm　and　0.45　nm/cm,　the　acceptance　temperature　bandwidths　are　2.30°C/cm　and　17.14°C/cm　respectively,　and　the　acceptance　angular　is　3.12°/cm1/2　at　room　temperature.　The　numerical　simulation　results　indicated　that　type　II　QPM　technology　is　more　suitable　for　second-harmonic-generation　(SHG)　than　type　I　.