Use NovAA 800 flame method to determine the content of Ca element in tablets. The standard curve fitting reached 0.9999, and the sample parallelism was good. In the case of high salt content in the sample, the RSD range of 10 samples tested continuously for 3 hours was 1.7-3.1%, and the results were stable and reliable. ASS-NovAA 800 can meet the determination of Ca element content in tablets.