[Objective] Explore the current status and development trends in future with the change of numbers of cloud services. [Methods] Grab entries of cloud service concepts of Google search engine in last 12 years, using time series analysis. [Results] Cloud services can be divided into steep-type, pulse-type and wave-type categories. Steep-type cloud service will continue to grow, but the growth trend will slow down. It is unlikely for pulse-type cloud service to grow.The development trend of pulse-type cloud service is instability. [Limitations] Analyze trends of cloud services only from the time ...