Solar　greenhouse　can　be　realized　in　the　winter　counter-season　production,　soil　temperature　is　to　ensure　that　the　normal　growth　of　crops　is　one　of　the　key　factors.　Grasp　the　solar　greenhouse　soil　heat　transfer　characteristics　and　its　temperature　change　law,　the　solar　greenhouse　thermal　environment　effectively　create　an　important　significance.　This　study　intends　to　start　from　the　greenhouse　soil　temperature　distribution　characteristics,　based　on　the　principle　of　heat　transfer　superposition,　combined　with　a　large　number　of　measured　results,　analyzes　the　soil　temperature　along　the　greenhouse　span.　Further,　combining　with　the　geometric　characteristics　of　solar　greenhouse　and　plant　growth　law,　this　study　proposes　a　mechanism　for　optimizing　the　winter　thermal　environment　of　large-span　solar　greenhouses　and　its　design　method　for　mechanized　operation.　The　research　results　show　that,　influenced　by　the　special　structure,　the　soil　temperature　of　the　greenhouse　presents　the　distribution　law　of　low　south　and　high　north,　which　directly　leads　to　the　poor　growth　of　crops　in　the　south　side.　The　mathematical　model　of　soil　temperature　effectively　reflects　the　dynamic　change　law　of　soil　temperature,　and　the　measured　results　verify　the　validity　of　the　model.　The　concept　of　cold/heat　zoning　of　solar　greenhouse　and　its　design　method　proposed　in　this　study　are　scientific　and　feasible.　In　winter,　compared　with　the　control　solar　greenhouse,　the　indoor　air　and　soil　temperature　of　the　new　greenhouse　increased　by　1.11　°C　and　0.36　°C,　the　energy　consumption　for　active　heating　is　reduced　by　2889.92　MJ,　the　construction　space　increased　by　27.3　%,　and　the　land　utilization　rate　increased　by　9.5　%.　The　result　of　this　study　provides　new　concepts　and　methods　for　the　scientific　design　of　solar　greenhouse.　©　2024