Abstract: The SNT-DT/25 type neutron tube was developed by drive-in target technology. Focused on the strict advices for well-logging neutron tube, the important parameters, such as neutron yield, stability, life span, were investigated on the special platform for neutron tube annealing. The results suggested that the operating temperature was as high as 175 ℃, the limit yield reached up to 10⁹ n/s, the neutron yield changed less than 10%, and the neutron yield could reach to 1×10⁸ n/s with acceleration voltage -80 kV and the anode current of 300 μA. Besides, the effect of target voltage and anodic current with neutron yield was analyzed.