Abstract: For the problem that the remaining useful life of plant new variety right is difficult to determine when economic analysis is conducted, this paper uses the Weibull Survival Analysis Method and Gauss Model to study how to accurately estimate the remaining useful life of plant new variety right. The results showed that the average life of the rice granted varieties was 10.013 years, and with the increase of the age of plant variety rights, the probability that the same residual life Tt reached x was more and more small, the reliability was more and more low, the greater was the probability of the invalid variety right; the remaining useful life of a specific rice granted variety was closely related to the demonstration promotion age which the rice granted variety reached its maximum area, when the rice granted variety achieved the demonstration promotion age of the maximum area, the emergence of alternative varieties would make its promotion area decrease, accordingly its remaining useful life would be shortened. Therefore, using Weibull Survival Analysis Method and Gauss Model could describe the remaining useful life’s time trend, but also determine the remaining useful life of a concrete plant variety right, and clarify the entire life time of varieties rights, and make the economic analysis of plant new varieties rights more accurate and reasonable.