A three dimensional printing (3D) apparatus and a three dimensional (3D) printing method are used for forming and stacking a plurality of modeling layers into a 3D object. The 3D printing apparatus includes a body having a modeling platform, a transmission module disposed on the body, a printing module, a curing module and a laser module. The printing module, the curing module and the laser module are disposed at and controlled by the transmission module to move relative to the body, respectively. A liquid modeling material is jetted from the printing module to the modeling platform and cured by the curing module to form the modeling layers. The laser module moves along a normal direction of the modeling platform according to a condition parameter and provides a laser beam along at least one plane parallel to the modeling platform to cut and trim at least one modeling layer.