Objective To explore the prediction value of cervical maturity evaluated by acoustic Elastography. Methods One hundred and eighty pregnant women of the third trimester who meet the requirements were divided into two groups. They were defined as TOL ≤ 1 week group of 102 patients and TOL> 1 week group of 78 patients. The general data, cervical length, cervical width, fetal exposure level, depth of embedded amniotic cavity and B/A value of two groups were recorded. Univariate and multivariate analyzes were used to screen independent influencing factors for predicting labor.And use ROC to analyze the potential prediction efficiency of each index.Results Cervical length, fetal exposure level and B/A value were independent predictors of labor, the fetal exposure height and B/A values were positively correlated.The AUC for cervical length was 0.780 with a sensitivity of 35.3% and a specificity of 100.0%;the AUC for fetal exposure height predicted for labor was 0.824 with a sensitivity of 73.5% and a specificity of 73.1%;the AUC for B/A value to predicte labor was 0.834, and the sensitivity was 97.1% , the specificity was 56.4%;the AUC of fetus exposed height combined with B/Avalue was 0.891,and the sensitivity was 67.6%, the specificity was 96.2% . ConclusionsB/A value has a certain value to predict labor,fetus exposed height combined with B/A value is more accurate to predict labor,it can be used as a new indicator of predictive labor.