Abstract: A series of electrolytic calorimetries have been carried out repeatedly for the system which consists of a Ti plate cathode, a Pt mesh anode and some deuteroxide lye by using a set of opened high-power electrolysis data processing apparatus made by ourselves. The variation of “excess heat” in Ti-Pt-D_2O system and the crystal structure of Ti cathode are measured round 100 ℃ and 70 ℃, respectively. Compared the data we’ve obtained with references’, the amount of “excess heat”, the efficiency to make “excess heat” and the onset time of “excess heat”, may be depended on the temperature of electrolyte in use mainly, and the cycle of electrolysis, the shape and surface of the cathode selected, and the like. Therefore, to produce a measurable, reliable and repeatable “excess heat” will not always spend a long time. Analysis data indicates that most of Ti belong to hexad cubic system of α-Ti changes to cubic system of β-TiD_2, and the existance of new elements in electrolytic products is determined. Another, the “heat of death” phenomenon is not observed in our calorimetry.