Reversed field pinch experiments have been performed by using a small size device, which is characterized a high aspect ratio and high current density. The RFP configuration has been achieved as follows; the duration is about 0.3 ms, the plasma current is 25 kA that corresponds to the average current density exceeds 4 MA/m2, and the loop voltage is about 40 V. In the plasma, we have observed asymmetry in the radial profile of the magnetic field and dynamic behavior of the RFP plasma disruption. From the relation between the toroidal magnetic flux and the plasma current, the effective inductance is obtained and compared with the theoretical value.