Purpose To apply the pruning algorithms in the risk factors screening that may influence the leukemia prognosis in six months,to discuss the using of pruning neural networks in medicine analysis and find out the relationship between pruning neural network model and stepwise logistic model.

Research on the influence of different summer pruning methods on plum growth and development was carried out, The results were: compared to traditional non-pruning method,the treatment of cutting spring branch by one third and topping can bring fewer spring branches and stimulate growth of the secondary branches: 2.

Guichang,a Chinese gooseberry variety,was tested to study the effect of different pruning methods on its new vine development and yield.

A pruning algorithm based on entropy theory for designing BP neural network structure is proposed.

A pruning algorithm for neural network based on information entropy is proposed in this paper.

With consideration of the complexity of urban transportation, this papar constructs a model for the computation of shortest path and presents a tree pruned algorithm on the basis of this model.