Integrated　electro-optical　modulators　play　an　important　role　in　fields　such　as　broadband　wireless　communication　and　phase　code　radar.　Electro-optical　modulator　based　on　lithium　niobate　(LN)　ridge　waveguide　is　easy　to　be　integrated,　and　has　good　electro-optical　response.　In　this　paper,　a　cascade　modulator　based　on　the　lithium　niobate　thin-film　structure　is　designed　to　achieve　both　the　phase　and　intensity　modulation.　The　structure　parameters　of　the　modulator　are　determined　through　collaborative　simulation,　then　the　phase　modulator　and　the　intensity　modulator　are　simulated.　Then,　the　phase-intensity　cascade　modulator　is　simulated　to　test　the　output　light　field　in　three　working　states,　respectively.　The　experimental　results　show　that　it　not　only　can　perform　phase　modulation　or　intensity　modulation　of　the　input　light　wave　separately,　but　also　can　adjust　the　phase　and　intensity　of　the　light　waves　simultaneously.　©　2022　SPIE.