To provide a method for evaluating a mixing performance of a micro container for a mixture which is in a liquid state by using a fluid nuclear magnetic resonance analysis system.

The method for evaluating a mixing performance of the micro container for a mixture which is in a liquid state by using the fluid nuclear magnetic resonance analysis system includes the steps of: 1) feeding the mixture as a sample to a fluid nuclear magnetic resonance analysis apparatus via a test object micro container as a performance evaluation object; 2) obtaining a nuclear magnetic resonance spectrum of the sample fed by the previous step with the fluid nuclear magnetic resonance analysis apparatus; and 3) evaluating a mixing performance which the test object micro container has for the mixture, on the basis of a difference between the nuclear magnetic resonance spectrum thus obtained and a nuclear magnetic resonance spectrum to be compared.