Abstract: By measuring the expansion rate and relative dynamic elasitc modulus of concrete speciments at different age, that are immersed in the solution with 1M NaOH and a few different contents of NaCl, the tests of concrete under twofold factors of ASR and chloride corrosion are carried out. The rezults show that the expansion of concrete with high alkali content, immersed in different solution and in different age, is greater than that with low aklali content, and the loss of dynamic elastic modulus of former is also greater. The solution with higher concentration of chloride will obviousely accelerate the ASR expansion, mainly in the short time of early age, but the solution with lower content of chloride will continually keep the acceleration. And the change of dynamic elastic modulus for this time is as follow: at the initial stage of deterioration the modulus decreases rapidly and when the remainded modulus is at about 70% the drop slows down, then the progress of decreasing is very slow and up to lose efficacy entirely. Analysed the relationship between the dynamic elastic modulus and expansian rate, it is found that the damage of concrete by expansion is more sensitive when the expansion rate is lower than 0.5%.