Based on triangulation plane parametric method, the in-depth research of the complex surface flattening system has been attempted. The required database system of complex surface flattening algorithm is established. An attached LSCM algorithm is realized. To be continued, with a proposed initial parametric network, the auxiliary program is constructed with higher accuracy. A friendly interface in VB was finished and a complex surface flattening system is realized with Solidworks secondary development technology based on SolidworksAPI interfacing.