The decision-making of legislation opportunity is a necessary factor considered in the process of making law,which is Crucial for the improvement of legislation quality.The legislation opportunities are the vari-ous subjective and objective conditions considered when a decision is made about whether legislation should be done or not and the choice of legislation time.The legislation opportunities includin opportunities to make laws,revise laws and abolish laws in an abroad sense.The legislators should consider the legislation need and legisla-tion possibility when choosing the legislation opportunity.The legislation need includes three factors,such as the extent and the depth of human relations in society,etc.The legislation possibility also includes three factors,such as the legislation ability,etc.Meanwhile,legislatos may made decisions about the opportunity by three means: predicting the legislationing need;drawing up the legislation plan and short-term legislationmodel.