Based on non-back trace backward chaining Web Services dynamic composition framework
this paper proposes a backward chaining dynamic composition method to lower the execution price. In order to generate this synthes is program dynamically
the Web Service with minimal execution price is found in each step of the composition course of the algorithm based on user input/output and the execution price of Web Service. The composition approach takes into account the efficiency and execution price
so it is especially suitable for users who have requirements on the both.