Cement concrete pavement has the characteristics of strong bearing capacity,good stability and convenient construction,and has become the main type of pavement structure.In Fujian coastal area,the characteristics of ground materials,high temperature environment and early cracking performance have put forward higher requirements for pavement concrete performance.Material design according to local conditions is the focus of road mix ratio research at present.In this paper,according to the change of cement dosage,water cement ratio and sand ratio,the guiding principle of pavement material design is put forward.According to different additives（water reducing agent,expanding agent,air entraining agent）,high temperature environment in gale,four curing modes of geotextile,curing agent,water saving curing film and SAP（superabsorbent resin）,the early crack resistance of concrete is studied through water.Comparisons of chemical heat,micro and practical engineering are carried out to study the mechanism.The main conclusions are as follows:（1）Pavement concrete is dry-hard concrete.In material design,we should adhere to the principle of "double-low cement content and low sand ratio".At the same time,the vitreous consistency should be controlled at 20+2S and aggregate should be over 1400 kg/m3.Based on this case,the representative mix ratio is proposed as follows:cement 320 kg/m3,water-cement ratio 0.4,sand ratio 32%,gravel 1406 kg/m3（4.75-9.5:9.5～16:16～31.5～1:1:4）.Air entraining agent 1%.（2）The formation of ettringite by hydration of expansive agent can compensate the early shrinkage of concrete.Although water reducing agent and air entraining agent can inhibit the hydration of cement,the addition of water reducing agent and air entraining agent will result in the thinning of internal pore size,the increase of capillary pressure and the increase of early shrinkage.For slipform concrete construction,air entraining agent can form a large number of stable micro-bubbles in the process of vibration,increase the consistency of concrete,and improve the vibration viscosity coefficient.（3）Evaporation rate can be used as an evaluation criterion for early cracking of concrete.Among the environmental parameters,strong wind can increase the evaporation rate of concrete surface,and high temperature can promote the hydration of cement to a certain extent,which results in that the impact of strong wind on early cracking resistance of concrete is greater than that of high temperature.（4）Geotextiles,curing agents and water-saving curing membranes as natural curing methods mainly play the role of thermal insulation and reducing water evaporation;SAP can inhibit cement hydration and achieve the purpose of shrinkage and crack prevention by supplementing the internal moisture of concrete.However,the number and distribution of residual holes in concrete after SAP releasing water are large and widespread,resulting in the decrease of concrete strength.Based on the above research,the pavement mix design should follow the principle of low cement and low sand ratio,and the use of expansive agent can be considered to reduce the early shrinkage of concrete.Polycarboxylic acid water reducer should be used in slip form construction.The gas content should be controlled from 3%to 5%and the effective radius of a single vibrating rod should be 25 cm.The quality of pavement concrete can be guaranteed by reducing water evaporation,timely maintenance and shading during construction under high wind and high temperature environment.Water-saving curing film is the first choice in natural curing.SAP internal curing is recommended to use 30-60 meshes,with an additional water-cement ratio of 0.02 and a dosage of 0.2%.