Repeated phonocardiographic examinations were made on 65 cases with initial attack of rheumatic fever. A total of 52 patients having cardiac manifestation were served as consecutive study. Authors present the phonocardiographic features in the early stage of rheumatic carditis correlating with the activity of the disease; in most instances significant murmurs, gallop rhythm and abnormal splitting of pulmonic second sound are coincident in acute phase. Among significant murmurs apical mid-diastolic murmur displays its reversibility. The E/M at apex or ratio of the duration of electrical systole (QT-interval) to that of mechanical systole (I-II interval in apical Medium PCG) varies with the degree of rheumatic activity. Increasing value of this ratio is parallel with rheumatic process. From these results presence of rheumatic activity would cause flabby or feeble state of myocardium which may also be an important factor in generating significant murmurs as well as actual “valvulitis”.