Abstract: The transformation about pressure and temperature of fluid system in relativistic thermodynamics is discussed. By calling introducing force into the laboratory reference system, the contradiction in present literature between extension pressure and intension pressure has been eliminated. The obtained result is that two kinds of relativistic attribute about pressure of fluid system is consistent completely and are totally Lorentz scalar quantity. The relation between introducing work and heat is further analyzed. The result shows: different definition criterion of relation between work and heat will give out opposite result in relativistic temperature transformation, the focus of difference between Planck school and Ott school is whether the introducing work is acknowledged. At the last of this paper the ideal test in Landsberg temperature paradox is completely recounted, concluding that the classical definition criterion of relation between work and heat will surely lead to the contraction of motion temperature.