Abstract: 5-Aminolevulinic acid is an essential substance, which is mainly applied in agriculture, such as a new photoactivity growth regulator, which has higher selectivity and non-toxicity. The paper generalized the physiological function of 5-aminolevulinic acid, and summarized its application impact in agricultural production. It has been attracted by both re-searchers and industry field and further regarded as board application potential and market exploitive potential. The synthesis route in which the δ-aminolevulinic acid was prepared by different ways is described. This paper will become a base for further application and research.