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This paper presents a ceramic tiles surface flatness online detection based on laser technique and 3D visual scene simulation technology. The overall design scheme was given and we established the detection system’s 3D scene modeling through Multigen Creator and Vega Prime visual simulation software, then, apply them into a single document framework based on vs2010. The true value often can’t be obtained in the practical measuring process, so the uncertainty of the laser installing angle offset error was analyzed, and we know the offset error uncertainty lower than 0.12 mm under 3 degrees. Through different experimental environments tests we knew this online detection system with high accuracy and replicate stability detection precision can reach 0.02 mm. This system can be applied for many fields online surface detection system.