In this paper, the influence of pore structure on the overall mechanical properties of concrete material is studied and analysed, and then the Firstly, three groups of concrete mix schemes were designed, and laboratory tests were carried out at different ages to analyze their macro characteristics and strength. Firstly, three groups of concrete mix schemes were designed, and laboratory tests were carried out at different ages to analyze their macro characteristics and strength. Then nuclear magnetic resonance technology was used to test the pore structure of the three groups. Firstly three groups of concrete mix schemes were designed, and laboratory tests were carried out at different ages to analyze their macro characteristics and strength. The results showed that: (1) Compared with the other two groups, Tr2 group has the highest strength, the The results showed that: (1) Compared with the other two groups, Tr2 group has the highest strength, the highest compactness and the best working performance. (2) With the growth of age, the proportion of harmless holes and less harmful holes increases obviously, but harmful holes and multiple harmful holes decrease. (3) There was an inverse relationship between the strength and the proportion of multiple holes. The above research can provide theoretical basis for concrete mix design.