The high temperature test of C60 high performance concrete slab mixed with or without polypropylene （PP） fiber and with or without steel mesh is carried out. By testing the temperature and thermal strain changes at different depths of the concrete slab under high temperature， the effect of PP fiber and steel mesh on the high temperature deformation performance of the concrete slab is studied. The results show that the temperature at each depth of the C60 high performance concrete slab increases with the passage of heating time， and decreases with the increase of the distance from the heating surface. Compared with the heating rate of the reinforced concrete slab without PP fiber at high temperature， adding PP fiber can reduce the heating rate of the reinforced concrete slab. The thermal strain of the concrete slab increases with the increase of the temperature at high temperature， and at the same temperature， the thermal strain is the largest at 50 mm from the bottom of the concrete slab. Compared with the thermal strain of reinforced concrete slab without PP fiber at high temperature， adding PP fiber can reduce the thermal strain of reinforced concrete slab， the maximum strain difference between the two measured at 25， 50， 75 mm from the bottom of the reinforced concrete slab are about 54，50，36 μm/m respectively. When the distance from the bottom is 25 mm， the thermal strain of the concrete around the steel bars under high temperature of the reinforced concrete slab is significantly less than that of the concrete without steel mesh， indicating that both steel bars and PP fibers can reduce the thermal strain of concrete and improve the deformation performance of concrete.