[en] In order to control effectively the nitrogen content of the zirconium alloy powder with strong activity, the research about the influencing factors during the process of the zirconium alloy preparation were carried out. Through analyzing the influencing factors during the process of the zirconium preparation, reducing the transient cracking temperature by adding alcohol medium when cracked the zirconium alloy, and removing the adsorbate under high temperature and black vacuum conditions, as well as protecting the zirconium hydride out of the furnace were studied. The combination nitrogen content of the powder and the total nitrogen content were measured by chemistry analysis technique, and high temperature and fusion method respectively; and the powder activity were analyzed. The results shown that adding alcohol medium is an effective method to reducing the nitrogen content of zirconium alloy; and removing the adsorbate under high temperature and black vacuum conditions can not realize the experimental purpose; moreover the method of protecting the zirconium hydride out of the furnace have some effective on reducing the nitrogen content of zirconium alloy, however, the result is not stable clearly. In this present study, it is found that a great deal physics-adsorption nitrogen among zirconium hydride have a direct influencing to the nitrogen content of zirconium alloy, and the transient cracking temperature is also an important influencing factor to it. (authors)