Abstract: The real-time monitoring and evaluating technique in acidizing is used for analyzing and calculating the variation of skin factor and judging acidizing effectiveness in real-time by measuring discharge capacity and injection pressure of acid in acidizing treatment. This paper studies three kinds of real-time monitoring models, by which the relevant software is developed-Application results of more than 10 wells in Tuha Oilfield show that it can be used for judging acidizing effectiveness in real-time, optimizing the acidization design, selecting the acid fluld ingredient, judging the feasibility of temporary plugging of inert gas on formation, and evaluating comprehensively the treatment results of single well. The key parameters in real-time monitoring are bottom-hole pressure and bottom-hole discharge capaclty, they can be only calculated by wellhead pressure and wellhead discharge capacity because there is not pressure and flow sensor for downhole strong acid condition.