In recent years, the small wheel typed rovers are focused on as an exploring rover. However, running performance of them are low on the loose ground. The ground is hardly compacted by wheels because weight of these rovers is small. Therefore, drawbar pull is low. Purpose of our research is to improve the running performance of these rovers using effects which are given by vibration to the ground. In this research, how to use vibration to improve running performance is confirmed. The difference of the ground before and after vibrating were confirmed through any experiments such as measurement of shearing strength and sinkage. these experiments were carried out using some shape wheels. Furthermore, some experiments using the testbed to run on the loose ground were carried out using some vibration timing patterns. From theses experimental results, we could get knowledge that how to use vibration to improve running performance for the small wheel typed rovers.