Fouling　of　heat　transfer　surfaces　causes　serious　technical　and　economic　problems　in　industry.　A　CFD　based　model　is　proposed　for　predicting　fouling　process　in　spiral-grooved　tubes.　This　model　considered　both　crystallization　at　heat　transfer　surface　and　deposition　of　crystal　forming　in　the　stream.　The　precision　of　this　model　was　validated　using　experiment　date.　It　was　proved　that　the　model　developed　in　this　work　can　predict　fouling　process　in　spiral-grooved　tubes　well.　©　(2011)　Trans　Tech　Publications.