The effects of five soil microbial inoculants on the characteristics of Nectarine plants in greenhouse were studied taking nectarine variety 'Freestone sweet' as test materials. The results showed that 5 kinds of soil microbial inoculants had a great effect on the plant characteristics of nectarine. The overall effect of treatment 4 was best,which had the best effect on increasing plant height and DBH, and the difference between DBH and CK was significant. It could reduce the number of leaf buds, promote the growth of new branches, increase the distance between new branches, increase the length, width, Pn, Tr and Chi of leaves and so on. The treatment 5 promoted the number of flower buds, which was significantly different from that of CK, and increased the Pn of leaves.