When the hydraulic fracture grows in formation ,the expected extension of hydraulic fracture would disrupt due to existing natural fracture ,which causes uncontrollable fracture trend .To study the real hydraulic fracture extension ,fracturing fluid leakage must be consid-ered after intersection of hydraulic fracture and natural fracture .This paper ,through researching fracturing fluid leakage in the interaction of hydraulic fracture and natural fracture ,analyzes four areas:the crack opening area ,crack leakage area ,fracture closure pressure area ,the original crack area on fracturing fluid invasion into the natural fracture ,and the corresponding control equation is obtained .This can provide better theoretical basis for the extension of hydraulic fracture and formation of crack network .%对于现场真实地层，当水力裂缝在地层中生长时，由于天然裂缝存在，会扰乱预期的水力裂缝的延伸，造成不可控的裂缝走向。要研究真实水力裂缝的延伸，就必须考虑水力裂缝与天然裂缝相交后的压裂液漏失情况。通过研究在水力裂缝与天然裂缝交互作用下，压裂液在天然裂缝中的漏失情况，得到压裂液侵入到天然裂缝中所存在的裂缝打开区、裂缝漏失区、裂缝闭合受压区、原始裂缝区四个区域，并且得到相应的控制方程，可更好地为水力裂缝的延伸和裂缝网的形成提供理论依据。
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