The titanium alloy VT3-1 has been used in fatigue tests. During the tests, there were performed Acoustic Emission monitoring. The main idea of the crack detection in fatigue tests is based on the introduced earlier “ -criterion”. “ -criterion” - break in the graph line that represents the total acoustic emission dependence on the number of loading cycles. After the fatigue test of specimen, it was subjected to monotonic tension up to the fast fracture.