The invention discloses a periodic demonstration method of longer-period material-changing renovation equipment from a nuclear power station, and the method comprises the following steps of: screening out systems and equipment affected by prolonging a material-changing period, acquiring related information of the equipment, analyzing fault modes and fault influence of the equipment with an RCM technology, acquiring the main fault mode and fault consequence of the equipment, in turn judging whether the fault consequence of the equipment is serious, the fault mode thereof is related to time, and time developed to the equipment fault is less than the material-changing period after renovation, gaining positive or negative feedback, when three feedback is positive, the equipment does not conform to requirements of prolonging the material-changing period, otherwise the equipment conform to the requirements of prolonging the material-changing period. The method has the beneficial effects that an important technology is provided for the longer-period material-changing renovation in the nuclear power station when operation and maintenance data of the nuclear power station is insufficient, operation and maintenance coost is reduced and the method is easily popularized.