We all want to know the odds of a disease. For instance, what's the ratio of the last death toll and the number of rehabilitation for people who get the flu? The thesis aims at studying the odds of Case Ⅱ interval-censored data. We apply the Bernstein polynomial to describe the statistical method of odds. We use the maximum approximate estimation method, however ; calculating the maximum approximate estimate is very complicated and difficult. Therefore, we adopt Markov chain Monte Carlo - Simulated Annealing to estimate its parameters, and we also conducted a lot of statistical simulation, and the results are quite satisfied.