根据创新型企业持续创新发展的需要, 针对创新型企业并购决策问题, 提出一种考虑到非期望产出的规模收益的并购决策方法.  首先, 基于仅限于期望产出的企业规模收益判断方法, 建立包含非期望产出的GDEA模型与WY-DEA模型; 其次, 利用GDEA模型判断弱WY-DEA有效并购方案的规模收益不变、递增、递减或拥挤四种状态; 然后, 在剔除规模收益拥挤的并购方案基础上, 利用交叉效率模型为被收购企业选择最优的收购方; 最后, 以算例说明方法的可行性与优势.

For innovative enterprises, sustainable innovation is the key to obtain and maintain competitive advantage. However, after ten years of construction and  evelopment of innovative enterprises in China, some enterprises have shown the situation that they can weaken the ability of sustainable innovation, and even can not maintain innovation. According to the existing foundation of innovation and the need for their sustainable development of innovative enterprises, this paper expounds the significance of the merger and acquisition (M & A) as an important way to realize the sustainable innovation. At the same time, a method of M & A decision is proposed, which takes into account the return to scale (RTS) of undesirable output. Firstly, a Generalized Data Envelopment Analysis (GDEA) model and a WY-DEA model with undesirable output are established, which are based on the judgment method of scale income which is limited to the desirable output. Secondly, the Generalized DEA model is used to determine whether the RTS of the weak WY-DEA effective M{\&}A schemes are constant, increasing, decreasing or crowded. Then on the basis of the elimination of the congestion plan, the cross efficiency model is used to select the optimal purchasing party. Finally, a numerical example is given to illustrate the feasibility and advantage of the method.