The Ion source is the heart of Accelerator instrument which can convert the gas to the plasma. With high voltage, ion beam is extracted from the plasma and applied to various fields. To test ion source, we set up an experimental station, which includes ion source system, extract system and focus system. During the experiment, ion beam is accelerated by high voltage and collected by the faraday cup, which absorb and show how many current ion beam have. The measured data showed the two major information, the first is whether the current verify space charge limited charge (SPCLC) on different extractor voltage. Second is whether the current increases on focusing voltage. Finally we compare it with ion beam simulation data, and analyze the result.