Extension neural networks have many appiications in shch aspects as: extension control, extension distinguish and extension forecast.

On the basis of a study of the Forecast of the international container Transportation, the writer chose to use the mode - buiding mechanism for expansion and collection forecast on domestic container transportation, builds an element mode for expansion and collection mechanism, and makes a forecast on domestic container shipping.

Topological forecast of annual sediment yield of debris flow along the Jiangjia Ravine;

In this paper,taking Xinjiang Line of New Eurasian Continental Bridge as an object,the damaged length caused by environmental hazards in Xinjiang Line was analyzed and forecasted by using topological forecasting method of Grey Theory.

A good forecast result has been concluded with a topological prediction model of gray system theory based on the observation data of ground water table in Lanxi County.

Based on the theory of Gray System, the topological prediction model on agricultural meteorological calamity in Gansu province was made and has beed used to predict the calamity changing trend in coming 12 years.

Extension detecting technology studies by Guangdong University of Technology professor Yu Yongquan proposed.

Extension detecting technology(EDT) is a new detecting technology based on extension theory, which is totally different from the existing traditional ones in both thoughtway and technology method.