According to the situation that there is no general model to express both main profile and modified top profile, a general integration equation expressed in tangential angle series was established for scroll profile. The start part of profile was reconstructed with zeroth-order curve and firstorder curve, respectively. The influence of parameters of top profile on thickness of scroll tooth was analyzed quantitatively. Furthermore, the geometrical models of area of compression chamber were set up based on curvature radius function of base line. The effect of curvature radius parameters on area property was explored. This study showed that first-order curve construction of top scroll could achieve higher performance by improving volume ratio while maintain reasonable tooth strength. With continuity equation of scroll baseline in form of radius of curvature, a fullymeshed profile and complete tooth profile could be obtained in the stage of machine design, so that there was no need to modify top scroll in later stages. The results could be applied in the scroll profile design.