Abstract: Ultrasonic liquid concentration analyzer has the advantage that: no contact,high accuracy, instant response, no harm to human body and the tested liquid, no moving parts rarely need maintainence, continuosly remotely on line measurement, no pollution etc. It could be widely used in chemistry and other industry regions. We invested the possibility of using sound speed method to measure the concentration of H₂SO₄ and compared its accuracy with the gravity method. The conclusion is that sound velocity method could be used in most of the concentration range, especially in the high concentration range its accuuracy is much higher than the gravity method.