介绍北安──黑河及“三江”的地方铁路和国铁联营的作法及取得的效果，并总结了联营的四个基本特点：把大通道的畅通作为联营的首要任务；把既有线的改造和少量地方铁路的新建当成主攻任务来抓；改扩建线路的资金来源由适当增加运价的运营收入来解决；在合资共建的基础上为逐步转化为股份制创造条件。 This article introduces the practices and achievements made by the local railways of the Bei’an-Heihe River and the “Sanjiang”, as well as the achievements they have made. It also summarizes the four basic characteristics of the joint venture: the smooth passage of large passages as the primary task of the joint venture; the transformation of the existing lines And a small amount of new railway construction as the main task to be grasped; the source of funds for the expansion and expansion routes by the appropriate increase in tariffs operating income to solve; on the basis of the joint venture to create the conditions for the progressive conversion into a shareholding system.