In order to study the growth behavior of type I (opening) type II (shearing type) compound cracks, numerical methods and experimental data are used to analyze the height of AA7075 material under I-II compound type (30°, 45°, 60°) loading. Cycle fatigue crack growth, the equivalent stress intensity factor amplitude (?K*) and cyclic J integral (?J) are used to describe the fatigue crack growth rate, and the corresponding Paris formula expression is given. ?K* is derived the relationship between the two and ?J under the theory of linear elastic fracture mechanics. The results show that the derived theoretical relationship between ?K* and ?J can provide the same results as the numerical method; since the equivalent stress intensity factors need to be obtained by empirical formulas, using ?J can effectively replace ?K* as a parameter that describes the growth rate of high-cycle composite fatigue cracks.