In a transitional period of economic ownership, traditional credit culture and systems have been destroyed while the new ones, owing to obscure ownership, incomplete and unsymmetrical information, have yet to be established.

In order to better provide basic analytical method for research of reservoir engineering for flow of horizontal well, the stable flow of horizontal well with non complete symmetry multiple well bore is researched according to pseudo 3 dimension idea and using conformal transformation and flow theory such as imaging theory and superposition principle and equivalent flow resistance method.

Credit-risk decision model with imperfect information;

This paper puts forward a partners selection model for virtual enterprises under the conditions of imperfect information.

The entered enterprise should conserve its advertisement cost under the situation of stationary imperfect information and select its optimization advertisement decision according to the probability of percolate cost under the situation of dynamic imperfect information.

Programming method of fuzzy group multiple criteria decision making with incomplete information;

Study on hierarchical discrimination approach of multi-criteria classification with incomplete information;

Superiority and inferiority ranking method formultiple criteria decision making with incomplete information on weights;

Trough researching, the author found some problems related to imperfect information.