Eleven components in soybean phospholipids were separated by TLC, using silica gel plate made in China and twice development. The quantitative analysis has been achived with dual wavelength TLC scanning. The calibration curve for PC is in the range between 0. 2-5. 0 μg and the detection limit is 0. 2 ×10- 6 g. This method has been applied to the analysis of PC in lecithin.