This article is to study the Lorentz force for various current and magnetic field as function of temperature on high-temperature Superconductor YBCO. We measure force and voltage by using a electronic balance and a voltmeter. We use a C-type magnet to apply magnetic field to our sample. From our experimental data, it is found that when YBCO is in normal state, the force satisfies Lorentz force (F=I L×B). In mixed state, the force is larger than Lorentz force. We use the flux drag force that acts on vortex to explain this situation. In superconducting state, the force is zero because the pinning force is too large.