Abstract: To solve the problem of the acquisition of Web service QoS effectively, this paper proposes an execution log based Web service QoS acquisition approach from the statistic point of view. Firstly, based on the Web service QoS attributes desiring to be acquired, this approach analyzes the log contents that have to be logged in and generates the execution log. Then, the Web service QoS point data set is extracted. For the problem that the QoS point data collected by real execution is small and distributes ununiformly, corresponding solutions are given. Finally, on the basis of the generated QoS point data set, the querying and prediction approaches of Web service QoS data are described. Experimental results show that the Web service QoS acquisition approach is accurate and practicable.