产品的寿命周期虽然是有限的 ,但产品在整个寿命周期中具有阶段性和连续性特点 ,揭示这一特点及其变化规律的理论是产品寿命周期理论。因此 ,运用它对现有产品进行评价 ,从而指导企业对现有产品的整顿改进和正确确定新产品的开发时机以及投放市场的时机有着极其重要的现实指导作用 Although the life cycle of a product is limited, the product has phased and continuous characteristics throughout the life cycle. The theory that reveals this and its changing law is the product life cycle theory. Therefore, it is used to evaluate existing products, thus guiding enterprises to have an extremely important practical guidance role in the improvement of existing products and the correct timing of the development of new products and the timing of market launch.