The content of sarsasapogenin in Xiandao granules was determined by TLC at 440 nm.Samples were dissolved in water, hydrolyzed with HCl for 3 h, extracted with chloroform, neutralized with a base, concentrated, and dissolved in chloroform again.The linear range was 0.515-3.090 μg μL-1.The average recovery was 97.83% with RSD of 2.37%.