准时生产方式（JIT）是起源于日本丰田汽车公司的一种生产管理方法。它的基本思想可用一句话来概括，即“只在需要的时候，按需要的量，生产所需的产品”，这种生产方式的核心是追求一种无库存生产系统，或使库存达到最小的生产系统，为此而开发了包括“看板”在内的一系列具体 On-time production (JIT) is a production management method that originated in Japan's Toyota Motor Corporation. Its basic idea can be summed up in one sentence, namely, “only when needed, according to the amount needed to produce the desired product”, the core of this mode of production is the pursuit of a non-stock production system, or inventory to a minimum Production system, for which the development of a “kanban”, including a series of specific