The PANDA collaboration will build a detector which consists of target and forward spectrometers and aims for studying fundamental questions of hadrons and nuclear physics in interactions of antiprotons with nucleons and nuclei. The detector will be used to identify neutral and charged particles generated within the antiproton-nucleon annihilation processes. The information will be used to perform high-precision tests of strong interactions. A small TPC that will be used for characterization process prior to the development of GEM based TPC for the target spectrometer of PANDA has been designed and built. CAD software was used to create models of all components of the TPC. This complex geometry was parsed into Geant4 detector constructor class. Results of the simulations and tests with the small TPC are presented.