Based on the concept and operations of winding and straight gray number, this paper gives the concept of the even value of complex blind number, and introduces the methods to apply it.

This paper states the background of producing compound blind number, and gives the definition of compound blind number, and then shows the relations between compound blind number and unascertained number, ac number, grey number and blind number.

This paper gives the concepts of compound blind number and it s credible degree, and sets up a BM\-2 mathematical model based on this concept.

A mathematical model for potential ecological risk assessment of sediments based on blind number theory;

Study on the blind number recognition of the calculation of roof pressure;

Optimization method and computer program based on the blind number theory;

The weighted unascertained number regressive model was proposed to improve the original model.

This paper applies the unascertained number theory to modelli.

In order to deal with unascertained information,an innovative method called unascertained number regressive is introduced to the forecasting of port handling capacity to prevent appearing distinct errors derived from lots of unascertained information.