ObjectTo explore the application of Gesell developmental scale-language part in language development evaluation by the comparison with S-S method. Method sA total of 130 children aged from 1.5 to 5 years were selected in psychological clinics of Child Care Center in the Xi 'an Fourth Hospital from June 2015 to May 2016.There were 93(71.54%) boys and 37(28.26%) girls.Gesell developmental scale and S-S method were both used to evaluate language retardation degree. Results 1)Overall consistency check of Gesell developmental scale and S-S method in language retardation showed:the Kappa score was 0.639(P<0.05),sensitivity was 77.2%,specificity was 86.3%.2)Overall consistency check of Gesell developmental scale and S-S method in mild language retardation showed that the Kappa score was 0.481(P<0.05).3)S-S method in mild language retardation for two age groups showed that the constituent ratio of language characteristics had statistical differences (P<0.05).Children under 2 years old mainly had problem in language expression,while children above 2 years old mainly had problem in language comprehension. Conclusions 1)Gesell developmental scale can be used as a language development screening tool.2)Gesell developmental scale and S-S method can be used in combination,S-S method can be used for qualitative,Gesell developmental scale can be used for severity classification.3)S-S method should be used to ascertain diagnosis for the children under 2 years old whose language scores of Gesell developmental scale show margin state.