Objective To dig the knowledge structure of lumbago's symptoms and acupoints in book Zhenjiu Jiayi Jing(A-B Classic of Acupuncture and Moxibustion)and Zhenjiu Dacheng(Compendium of Acupuncture and Moxibustion)in order to provide a possible scientific method for exploring their combination regularities in ancient Chinese medical books about acupuncture-moxibustion

and to investigate the feasibility and scientificity of the"association rule"in trimming the related ancient medical books and records.Methods The articles about lumbago's symptoms and employed acupoints were screened from classic medical book Zhenjiu Jiayi Jing and Zhenjiu Dacheng

followed by establishing a database.Then

the bidimensional correlation analysis about the lumbago-symptoms and symptoms-acupoints was conducted by using Apriori algorithm of Weka3.9.0 platform.Results A total of 153 entries about symptoms as spinalgia(31.68%)and cold limbs(25.74%)and the employed acupoints as Weizhong(BL40

17.60%)

Shenshu(BL23

9.60%)and Kunlun(BL60

6.40%)are found.The top 3 supplemented acupoints are BL40 for concomitant symptoms of spinalgia

BL23 for cold limbs

and BL60 for dizzy symptoms.Regarding the paired acupoints for lumbago

the most frequently used ones are BL23-BL40(30.40%).Conclusion In book Zhenjiu Jiayi Jing and Zhenjiu Dacheng

lumbago has chief symptoms of spinalgia and cold limbs that are mainly disorders of the Bladder Meridian of Foot Taiyang and Governor Vessel

and the acupoints of these two meridians are frequently selected in combination with some specific acupoints.