退耕还林还草工程具有的系统性、综合性、社会性和时效性特点 ,决定了工程任务的艰巨性、复杂性和工程措施的多样性 ,只有在总结的基础上 ,不断完善工程技术 ,制定出切实可行的政策 ,才能充分发挥工程的生态效益、社会效益、经济效益 ,并使三者之间以最佳的组合方式体现出来 ,使这一德政工程利国、利民 The systematic, comprehensive, social and timeliness features of the project of returning farmland to forest and grassland determine the arduousness and complexity of engineering tasks and the diversity of engineering measures. Only on the basis of conclusion, Formulate practical and feasible policies in order to give full play to the ecological benefits, social benefits and economic benefits of the project, and make the best combination of the three reflected in order to benefit the virtuous project of benefiting the country and benefiting the people