In order to explore the effect of saline-alkali improvement by sand mixed with surface soil in Yellow River Delta，the laboratory studies and field experiments were conducted to explore the influence of adding sand on soilinfiltration，soil physical-chemical properties and summer maizegrowth.The Yellow River sand was used as the additive for the moderatelysalinized soil from Binzhouarea，mixing sifted river sand into surfacesoil(0～ 20cm).The laboratory studies were one -dimension vertical infiltration experiment included five kinds of mixing proportion of sand:CK(0%)，S1(5%)，S2(10%)，S3(15%)，S4(20%).On the basis of laboratory studies，the field experiments set four kinds of mixingproportion:CK(0%)，S1(5%)，S2(10%)，S3(15%).All experiments were repeated three times.The resultsshowed that:(1)Mixing sand with surface soil improved soil infiltration.The infiltration rate increased with the mixingproportion.(2)Mixing sand to surface soil reduced the soil moisture content of adding sand layer，and increased soilmoisture content under thislayer.In the layer withoutsand，the water content of the 5%～ 15% sand treatments increasedwith the proportion of sandmixing，and the water content of 20% sand treatment was lower than those of the other mixedproportion.(3)The desalination indicators of the sand proportion 10%～ 20% were higher than that of control treatmentobviously.The average desalination rate of 15% sand was increased by 7.65% than that of control treatment，and the soildesalination depth and the standard desalination depth of 15% sand were increased by 1.51 and 1.06 cm.(4)The resultsof field experiment were same as laboratory study and verified the conclusion of the laboratory.The plant height，stemdiameter，leaf area，dry matter and yield of summer maize were better than control treatment；the increase rate of yield of15% sand treatment was themaximum，which was10.40%.Mixing sand with surface soil to improve saline -alkali soil inBinzhou area is effective and the most suitable proportion is15%.