This paper presents a twodimensional threetemperature physical model of Zpinch plasmas and its numerical methods. A twodimensional radiation magnetohydrodynamics code called Zpinch2DDG is developed, which numerically simulates Kr gaspuff plasma implosion based up on the real experimental parameters on the Qiang Guang1 generator. The evolutional pictures of the plasma density and temperature are given, and Xray radiation is analyzed physically. As a result, some universal conclusions about gaspuff implosion are summarized.