Triethanolamine, diethylenetriamine, triisopropanolamine, aminoethyl ethanolamine and polyvinyl ammonium phosphate were selected as early strength agents to study their effects on water consumption, setting time, adaptability to additives, mortar strength and other aspects of Portland cement standard consistency at small dosage. The test results show that the amount of water used for cement standard consistency increases with the addition of alcoholic amine compounds; the initial setting time and final setting time of cement are obviously shortened by triethanolamine and N-(2-hydroxyethyl) ethylenediamine; the initial setting time of cement is prolonged by triisopropanolamine and diethylenetriamine, and the final setting time of cement is shortened; the amount of triisopropanolamine and N-(2-hydroxyethyl) ethylenediamine is 0.2. When the content of N-(2-hydroxyethyl) ethylenediamine is 0.1, the fluidity of cement is increased, and the adaptability of cement and admixture is adversely affected by other groups. Except that the early strength of triisopropanolamine is lower than that of blank cement when the content of triisopropanolamine is 0.20 and 0.50, the other groups have different degrees of increase, and the later strength, triisopropanolamine can be mixed in any way. In quantity, it is obviously stronger than triethanolamine.