Abstract: Salt-alkali stress is an important factor threatening rice production safety. At present, there are some saline-alkali lands with a salt content of more than 0.4% in coastal rice area of Liaoning. Due to the high salt content, there is a lack of suitable varieties for development and planting. In view of this situation, 93 japonica rice germplasms were collected and their yield composition and salt tolerance index were analyzed under 0.4% salt stress. The results showed that salt-alkali stress had significant effects on effective panicle number, panicle grain number per hole and 1 000-grain weight. And, the correlation between grain number per hole and salt tolerance index was the most significant. Under the comprehensive effect of various yield factors, the mean yield of 93 germplasms decreased by 42.92%. However, the decrease of filling rate caused by starch synthase may be the main factor affecting grain number per panicle. Among the 93 germplasms, 5 germplasms were defined as having extremely high salt tolerance, namely Youyu 205, AT 5, Yan 19-1, Yan 19-9 and Yan 19-11. The results provided technical support and excellent germplasm for breeding salt-tolerant varieties.