As is well known,aliasing syndrome and confounding syndrome are the two causes of affecting the diagnostic capability of test algorithm,and aliasing syndrome is the most important cause.

Aliasing syndrome and confounding syndrome are the two causes of affecting the diagnostic capability of test generation algorithm, aliasing syndrome is the most important cause.

It can build perfect fault diagnosis model through learning if the fault information is not complete and has the capability to assess the diagnosability of the fault diagnosis model which can be used for optimal symptom selection.

The mathematic model of fuzzy recognition and the conditional distribution function of fuzzy relationship between failure and symptom are given.

Anticipating the complex characteristics of gas drilling in the course of drilling,using the immediate symptoms during before or during the accident occurred to forecast and treat down hole accidents timely is key of gas drilling.

Inference-software platform designed base on the omen, can be used for the test point data sampled,and be used for the sequence classify method for data processed,also used for reasonable recognize,inference and decide to the radar trouble on the changeable unit degree,gets right result.

Inference software platform is designed to be based on the omen.

The premonitor of gushing water and recognition of origin - water are expounded, and put forward the predictive melhod of gushing waler.