[en] Levitation force of YBaCuO bulk below 77 K and trapped flux dependence of levitation force are studied. Experimental results show that levitation forces increase with decreasing of temperature and decrease approximately linearly with increasing of trapped flux. Guidance forces of a single YBaCuO bulk and YBaCuO bulk arrays are investigated in different field-cooling cases. Results show that guidance force exhibits much hysteresis; moreover, the hysteresis increases with decreasing of measurement height. Both trapped flux and applied field have much influence on the guidance force. Smaller lateral displacement may lead to the elastic lateral motion of the YBaCuO bulk arrays