We focused on the machining performance of Ti6Al4V′s electrochemical jet machining (EJM) with the use of ultrasonic assistance (UA). When EJM is applied to process Ti6Al4V, the passivating layer on the surface always reduces the machining efficiency. Sodium nitrate solution (NaNO3) and sodium chloride solution (NaCl) were tested in Ti6Al4V′s EJM with the use of UA, respectively. By analyzing the channel aspect ratio (depth/width), channel surface roughness (Sa), oxide percentage and surface topography of the machined workpiece under the condition of normal EJM and EJM with UA under the frequencies of 25, 68,135 kHz, the effect of UA for EJM was validated, which offered a new idea for improving the quality and efficiency of Ti6Al4V′s EJM performance.