Focusing　on　the　topic　of　model　integration,　we　develop　a　Workflow-based　Spatial　Modeling　Environment　(WF-SME)　which　enables　scientists　and　modeling　users　easy　to　design　and　create　of　complex　systems　models　through　a　drag-drop　operation　or　editing　mathematical　formula　in　model　constructor.　WF-SME,　a　visual　integrated　modeling　environment　is　mainly　used　for　the　rapid　realization　of　model　dynamic　integration,　in　which　we　can　implement　the　composition　and　connection　of　the　existing　models,　and　generate　new　model　through　graphical　operation.　The　papers　firstly　introduce　the　framework　of　model　integration　designed　for　WF-SME　as　well　as　its　supporting　theory,　and　then　explain　in　detail　how　the　modules　of　WF-SME　have　been　realized.　WF-SME　is　a　platform　for　spatial　modelling,　which　was　designed　in　four　parts,　Spatial　Workflow　Designer,　Model　builder,　Spatial　Calculation　engine　and　Visualization　of　Modelling　Output.　The　spatial　workflow　designer　built-in　WF-SME　shipping　with　toolsets　was　adopted　to　create　spatial　workflow,　reuse　and　aggregate　models.　Consisting　of　equation　editor　and　data　banding　tool,　the　model　builder　enable　modeller　updates　formulas　on-demand.　This　editor　parsed　by　MathML　is　powerful　and　flexible　enough　for　the　requirements　of　expressions　of　mathematical　calculations.　The　spatial　calculating　engine　developed　based　on　component,　through　the　map　algebra　language,　executes　mathematical　calculations.　The　multi-form　visualization　module　was　developed　to　provide　visual　expression　for　a　series　of　intermediate　data　and　its　result　of　the　domain　models.　Finally,　we　illustrate　how　the　typical　practical　application　sample　has　been　modeled　in　our　modeling　environment　to　validate　the　feasibility　and　efficiency　of　WF-SME.　As　a　case　study,　grassland　ecosystem　productivity　mechanism　model　whose　input　parameters　include　PAR　(Photo　synthetically　active　radiation),　Temperature,　Precipitation,　Soil　fertility　etc,　were　build　using　WF-SME.　By　the　experiments,　it　is　shown　that　our　research　is　a　new　attempt　for　model　components　reusing　and　complicated　models　integration,　and　WF-SME　has　been　satisfied　for　complicatedly　modeling　in　multi-domain　of　resource　and　environment.