The research aimed to study the dynamic changes of soil salinity，pH，moisture and temperature during thegrowth period of shoal wheat under different line spacing and strawmulch，and to determine the effects of the combination of row spacing and straw mulch on the yield of shoal wheat and its constituent factors. A wheat planting experiment was carriedout from November 2021 to June 2022 in the coastal tidal flat area ofNantong，Jiangsu province. Two row spacing modesincluding uniform row spacing of 25 cm+25 cm(A1)and wide and narrow row width of 30 cm+20 cm(A2)，and threestraw mulching amounts of0(S0)，1.5(S1)and 3.0 t/hm²(S2)were set up in the experiment. The results showed that the salt of soil layers 0-20 and 20-40 cm in each treatment had similar seasonal characteristics during the process of wheatplanting in the coastal beach. The salt change was relatively stable from December to February of the nextyear，the saltdecreased significantly in March，and then the soil salt returned with the increase of temperature. At the same time，thesoil salinity of 0-20 and 20-40 cm under S1 and S2 treatments was significantly lower than that under S0 treatmentoverall，but there was no significant difference in soil salinity between A1 and A2 modes. On thewhole，there was no significantdifference in the yield of shoal wheat under A1 and A2 modes. Compared with S0treatment，the yield of shoal wheat underS1 and S2 treatments was increased by 8.68% and11.58%，respectively( P<0.05). From the analysis of yield compositionfactors，the panicle number increased by 8.90% and 7.91% under S1 and S2treatments，compared with S0treatment，andthe panicle number increased by 6.23% and 6.23% under S1 and S2treatments，compared with S0treatment，respectively.Therefore，it was concluded that straw mulching had a better effect on salt control and salt reduction of topsoil，and thedecrease of salt in wheat jointing stage promoted the formation of wheat paniclenumber，and the decrease of soil salt returnin wheat booting stage promoted the increase of grain number perpanicle，and finally achieved the purpose of wheat yield increase in the coastal tidal flat area.