As　an　important　component　of　space　environment,　the　ionospheric　plasma　is　the　main　background　environment　for　the　operation　of　low-orbit　spacecraft.　The　study　of　ionospheric　plasma　environment　parameters　and　the　enrichment　of　plasma　environment　data　are　beneficial　to　improve　the　reliability　of　low-orbit　spacecraft　operation.　Langmuir　probe　is　the　most　popular　method　for　detecting　the　plasma　parameter　of　ionospheric,　however,　it　has　some　defects.　In　this　paper,　we　design　a　plasma　generator　based　on　radio-frequency　discharge　to　imitate　the　ionospheric　plasma　environment,　and　measure　plasma　parameter　based　on　Thomson　scattering　by　import　a　Nd:　YAG　laser　oscillate　in　the　plasma　generator.　The　result　demonstrates　that　the　intensity　of　laser　Thomson　scattering　signal　is　positively　correlated　with　the　change　of　plasma　electron　density.　The　electron　density　in　the　plasma　generator　is　calculated　according　to　the　laser　Thomson　scattering　signal　intensity,　and　the　error　is　less　than　10%　compared　with　that　measured　by　the　Langmuir　probe.　©　2021　SPIE.