Objective: To establish a method for determination of α-terthienyl in Radix Echinopsis by GC. Method: A simple GC method was developed with DA-INOWAX polythylene glycol capillary column (0.25 μm×0.25 mm

30 m) with FID detector.N2 was carrier gas

injection port temperature

column temperature and FID detector were used at 240 ℃

splittless mode.The sample size was 1 μL and column flow rate at 1.9 mL·min-1. Result: On this condition

good linear within the concentration range of 0.142 9-1.429 0 g·L-1(r=0.999 6)

with an average recovery rate of 98.56%.(RSD 0.77%

n=6). Conclusion: This method is accurate

simple

and good reproducibility

which can be used for the determination of α-terthienyl in Radix Echinopsis.