Abstract: In order to understand the effect and regulatory role of auxin on different organs of plants, this paper summarizes the research progress of auxin in the growth and development of plant roots, stems, leaves, flowers, fruits and seeds in recent years. It mainly included: auxin can promote the germination and growth of lateral roots and adventitious roots of plants; promote cell division, extension and differentiation to promote the elongation of plant stems; promote flower bud germination and affect the morphogenesis and senescence of flowers; promote fruit development and parthenocarpy; and affect fruit enlargement and fruit ripening; promote the accumulation of photosynthetic product and affect the formation of seed embryos. In addition, the physiological characteristics, transport mechanisms, and signal transduction mechanisms of auxin transport were also reviewed. It was learned that the auxin''s regulatory effects in plants were mainly manifested in apical dominance, tissue differentiation, organ formation, tropic reaction, morphogenesis and other aspects. At the same time, the deficiencies of auxin in the regulation of network signals and the allocation of various organs were also proposed, in order to provide reference for further research.