On the basis of fuzzy c - partition cluster method, the applicability of clustering algorithm is analyzed in five main aspects in view of main factors that affect cluster result of objective function cluster method.

Fuzzy pseudo F\|statistic is used to determine the best cluster number during the clustering procedure to remedy the shortcoming in conventional objective function cluster method.

Improvement of objective function based on dose constrain in inverse planning optimization of intensity-modulated radiotherapy;

Fuzzy modeling of nonlinear system with matrices decomposition based on objective function;

Discussion on engineering economic principles in majorized objective function of water supply pipe network;

The optimization of trajectory for stepped horizontal wells takes well design depth or friction as the target function, which is only based on techniques.

The first,ascertain the target function,second,build constraint condition,finally carried out the optimization designs,because of the target function is multivariate,no linearity,constraint condition is many but complicated,adopt direct search for delaminating iterative method,the compound shape secretly schemes against face to face much,take and the optimum so.

Under the condition that the tension stress does not arise in the female die inwall, which can be defined as target function.