A method of visualizing the temporal changes in the deformation of suspensions simultaneously with rheological measurements was developed. The observed heterogeneity can only be identified by visual means. The diverse results which can normally be obtained only by stress measurements can be explained with the aid of visualization results, thus remarkably contributing to the understandings of the difficult rheological mechanism involved. The following major findings were obtained. It was reconfirmed that suspensions are statistically solid bodies. An initial yielding is difficult to detect unless by visual means. The characteristic properties of the solid body are either a limiting strain within which the suspension behaves as an elastic body (for Na‐bentonite, for example) or a static yield (for kaolin in water, etc.). The former could be recognized to have some binding force between particle and liquid. After yielding, the stress continues to increase, but at slow rotation velocity, deformation begins to converge into local streaming. Thus, the strain and strain rate within the sample are considerably larger than those calculated. By employing the real strain, it was confirmed that the stress increase is attributable to rheopexical hardening, being more important than thixotropic stress reduction. Confirmation was also made that the static yield stress on the elastic limit coincides well with the stress on extrapolation to zero shear rate in the stress‐shear rate relationship.