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Case Teaching is a kind of teaching methods to guide the students to discuss the special situation through describing a specific scene. It is a teaching activity that takes teaching cases as the carriers and selects certain teaching cases according to the teaching aims. Case teaching and network teaching should be combined to form a new type of teaching called Case Teaching Based on the Network which can play their roles better in teaching.

The first step of detecting relating rule is a process at the cost of much system resource, so the total performance of detecting relating rule is determined by this step. The main goal of existing algorithms at present is focused on the efficiency of this step. DHP and PHP are included in those algorithms and these two algorithms are the transmutations of Apriori algorithm to improve its validity. PHP is developed based on DHP and it saves the CPU running time of DHP effectively. It is useful in improving the efficiency of detecting relating rule in commercial database by developing PHP algorithms to reduce the CPU calculating time.