This algorithm makes use of a principle of dynamic updating connecting itemsets against the item increasing in n set of frequent itemsets to obtain any frequent itemsets and though researches and analyses,it can be seen that this algorithm will get all frequent itemsets by scanning database only once.

The union project practice,the analysis determines the additional project unit price the concrete method and the determination principle,in the introduction general file about the additional project unit price request,the negotiations skill and the determination unit price matters needing attention.