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Based on semi-analytical theory, end-pumped thermal lens and distortion field of a rectangle YVO4-Nd:YVO4 composite crystal by the diode laser with super-Gaussian mode was researched. The result shows that when the output power of diode laser is 10 W, the pump-face centre of 0.5 at.-% neodymium-doped YVO4-Nd:YVO4 composite crystal can get 147 mm maximal thermal focal length (when k = 5) and has 2.34 mum thermal distortion (when k = 1). It can be concluded that end-pumped thermal lens and distortion field of YVO4-Nd:YVO4 composite crystal have obvious varies with ranks of super-Gaussian. The method can also be applied to the research on other thermal problems of composite crystal, which can offer theoretical basis for efficiently resolving the thermal problems in laser system.