This thesis presents the simulation and implementation of the characteristics of diac. Generally, the scope of this project included two main sections of work, which is a simulation section and hardware software program of (PSIM). The characteristics curve of voltage-current is plotted for the diac. In hardware implementation part, the package type of diac that is used is DO-35 with series number of DB3. A comparison between the implementation results and simulation results in terms of differences and similarities is investigated. Problems encountered during the progress of project are discussed and the solutions of the problems are provided in this thesis. Lastly, this thesis included conclusion and suggestion for future development.