BACKGROUND: Normal sagittal balance of cervical spine is the key to cervical spine orthopedic surgery. As the complexity of the anatomical structure and physiological function of the cervical spine, accurate measurement of sagittal balance parameters and correlation between parameters become an important reference for preoperative planning and postoperative evaluation of curative effect. Current research focuses on patients with clinical symptoms of cervical syondylosis. OBJECTIVE: To investigate the correlation of parameters of lordosis type cervical spine saggital plane in asymptomatic adults. METHODS: Cervical anteroposterior and lateral DR images of 120 adult patients with asymptomatic lordosis type cervical spine were retrospectively analyzed. The subjects were divided into three groups according to age: group A (21-40 years), group B (41-60 years), and group C (61-80 years). The sagittal parameters of the cervical spine were measured, including C2-C7 sagittal vertical axis (C2-C7 SVA), central of gravity to C7, sagittal vertical axis (CG-C7 SVA), T1 slope, C0-C2 Cobb angle and C2-C7 Cobb angle. The correlation between different imaging parameters and age was analyzed. This study was approved by the Ethics Committee, First Hospital of Shijiazhuang and Second Hospital of Hebei Medical University. All subjects signed the informed consent. RESULTS AND CONCLUSION: (1) C2-C7 SVA (F=11.188, P < 0.001), CG-C7 SVA (F=6.132, P=0.003) and T1 slope (F=11.682, P < 0.001) were significantly different among different groups. There was no significant difference in C0-C2 Cobb angle (F=1.178, P=0.311) and C2C7 Cobb angle (F=0.860, P=0.426)- (2) T1 slope was (51.63±5.85)°, (54.66±5.58)° and (57.48±4.74)° in groups A, Band C, respectively. Linear correlation analysis showed that T1 slope was positively correlated with age (r-0.533, P < 0.001 ). T1 slope was positively correlated with C2-C7 Cobb angle (r-0.561, P < 0.001). These results indicated that T1 slope increased with age in asymptomatic cervical lordosis adults. Moreover, T1 slope was positively correlated with age. [ABSTRACT FROM AUTHOR]