In order to obtain mass flow rate of a new pasty fuel-rich propellant, two measuring methods were studied in the development process of new pasty propellant ramjet, one is weighing, another is changing medium. The paper introduces the character of new pasty fuel-rich propellant briefly, and lists some influences on flow measurement. After that, measuring principle of two methods are introduced, two methods are compared in test. By contrast, the method of changing medium can measure mass flow rate of pasty propellant more accurately.