Abstract: Earth fissure and its environment is a nonlinear system.The time-spatial structure of Yuci earth fissure and its environment is discussed by using the fractal theory.The fractal of earth fissure,fault,earthquake and physiognomy of Yuci are calculated and compared.The author concludes that the earth fissure and its environment have the self-similarity character.Its fractal is 1.21,similar with fault's fractal which is 1.1905.The connection between earth fissure and earthquake is analyzed and both of them are controlled by tectonic activity.According as the descend of the fractal of fore earthquake and the a scent of the fractal of back ea rthquake,the forecast of earth fissure by comparison of fractal of earthquake with that before and after the form of earth fissure is studied.