Improvement Of DEA Model And Its Application On Efficiency Evaluation Of Listed Companies

After joining the WTO, The market competition environment is becoming increasingly fierce, the enterprises in China are facing unprecedented opportunities and challenges, to maintain and enhance competitiveness, improve the efficiency is an effective way. Efficiency evaluation is an important content of efficiency and it is a basic guarantee for efficiency enhancing. Objectively and scientifically on efficiency evaluation of the listed company to found itself in the advantages and disadvantages, and through the improvement of management strategies to improve efficiency evaluation and market competitiveness, so it is an important premise for improving the competitiveness of listed companies. However the traditional efficiency evaluation method has great limitations, on one hand, it take the listed company as "black box", ignore the internal mechanism and just take the initial input and output to investigate the efficiency, it can't has comprehensive result, thus it is necessary to explore internal operation process from the Angle of the listed company efficiency evaluation, On the other hand, the traditional method for most static evaluation, and located in practical production process is a dynamic process, it will be as itself and the changes in the outside world and the corresponding adjustment, static evaluation results do not reflect the real operation efficiency, which affects the correctness of the decision-making, even the company's strategic errors affect the correct operating company, therefore, it is necessary to study the dynamic process of production efficiency.Based on the existing theory and empirical research, on the basis of the first two stages DEA model was studied, it has some problems, including the system elements, the system structure, and the mixed problem with system elements is deduced for the improvement of two phase correlation DEA model, including constant scale under two stages of remuneration DEA model, related variable scale under two stages of remuneration of the DEA model associated. According to the changes of the influence of efficiency, increase efficiency loss value on the concept of value, efficiency, efficiency loss (enhancement) in a certain extent, reflected elements loss (enhancement). Secondly, combined with the practical process of listed companies operating in China, with 14 listed Banks, as an example, the relative evaluation results improved two-phase association DEA model, applicability, and stronger ability to identify more close to reality the results. Finally, in the empirical research on the basis of Chinese listed the actual situation of Banks and puts forward the corresponding ways to improve efficiency and management level of Chinese listed Banks and market competitiveness has important reference value.