Using Muskmelon cultivar ‘Jinfei’as the test material, five salinity levels（0, 25, 50, 75, 100mmol·L^-1）were set in the experiment by substrate cultivation methods. The effect of different concentrations of salinity stress on muskmelon seedling height, stem diameter, leaf area, root volume and dry matter accumulation werestudied to provide a reference for protected melon cultivation on Saline in Daqing region. The results showed that 25mmol·L^-1concentrations of salinity stress promoted muskmelon seedling stem diameter, height and shoot and rootdry matter accumulation. 50 mmol·L^-1concentrations only promoted root dry weight. 75~100 mmol·L^-1concentration inhibited muskmelon seedling stem diameter, height and shoot and root dry matter accumulation and100 mmol·L^-1inhibitory effect was significantly strengthened. The salt and alkali stresses inhabited relative watercontent of shoot and root, root growth, leaf area expansion of muskmelon seedling, and it depended on salt and alkaliconcentration and stress duration.Compared with shoot, dry matter distribution ratio on root was increased by saltand alkali stresses.