Innovation rate = [equipment service life/(equipment service life+equipment service life) ]* 100% or innovation rate = [(equipment service life-equipment service life)/equipment service life ]* 100% Innovation rate is the ratio of the present value of the appraised object to its new state replacement value. The innovation rate refers to: reflecting the old and new degree of equipment, that is, the ratio of the present value of equipment to its new state replacement value. Because there are many factors that affect the innovation rate, it involves the design, manufacture, maintenance, repair and transformation of equipment. The new rate of equipment should be determined not only according to the length of its service time, but also through the on-site observation and testing of equipment to determine its current technical state, and comprehensively consider tangible loss and intangible loss and other factors to determine scientifically and reasonably. reference data