PASI – Psoriasis Area Severity Index is the most used scoring system to score the severity of psoriasis, a long lasting genetic skin condition. This disease effects 2-4% population. It take much time of doctor to determine the severity because they have to estimate the affected area and three other related scores: redness, thickness and scaling. These estimation work leads to an inconsistency problem. Our PASI scoring system can provide a detail and stable scoring result in real time. The ability to processing in batches significantly decrease the work for doctors.