Concrete pavement slab may get a significant built-in curling for dry shrinkage and built in temperature gradient during early age. Effection of built-in curling of slab on dynamic load and riding comfort were analyzed based on quarter vehicle vibration model and road-vehicle dynamic interaction analysis method.The results show that built-in curling has more effects on roughness and random dynamic load of higher-grade pavement, and the main effects on road roughness and vehicle random dynamic load parameters relative to frequency of (slab length/speed). Built-in curling and environmental temperature gradient overlay will produce upward or downward curling, slab upward curling have a larger influence on the pavement roughness and random dynamic load, down warping has little effect. sensitivity analysis show the riding comfort, pavement grade, vehicle parameters and speed have more significant effectiton than curling. three roll shaft constuction built-in curling shape have a higher effect than built in curling. Effective built-in temperature difference keep below -10 ℃ may lead to a good performance of pavement slab.