Cloud computing provides shared computer processing resources and data to computers and other devices on demand. Most cloud platform is based on CPUs and GPUs, whose power consumption can be very high. Here we design a reconfigurable cloud platform, which uses our CHAMELEON CGRA chip as accelerator. Each CHAMELEON chip has 4x8x8 reconfigurable PEs using 65nm technology. We integrate two CHAMELEON chips onto a FPGA-assisted PCI-E board, and insert four PCI-E boards in one server. An elastic management system is build over a five-node (1 master + 4 slaves) cluster.  The computing speed shows a near-linear relationship with the number of computing nodes, and the computing efficiency is about three orders-of-magnitude better than Xeon CPU under 200MHz clock.