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站台形式方案设计是城市轨道交通线路规划与建设中的一项重要内容。本文结合北京轨道交通亦庄线宋家庄站的特点，阐述了一岛两侧双线、一岛一侧双线、一岛一侧三线等3种站台形式方案的基本设计概况，并从候车条件、折返能力、列车出入段条件、车站规模等方面对这3种方案进行了较为深入的对比研究。最后，从岛式站台站前折返能力的影响因素，以及站台客流组织方案对站台宽度和列车停站时间的影响等角度，提出了一岛两侧双线是适合于采用岛式站台、站前折返的城市轨道交通线路起点站的站台形式方案。

Case Analysis on Platform Design of Urban Rail Transit System

Form design of platforms is an important part of urban rail transit planning and construction.In this paper,the characteristics of Songjiazhuang Station of Beijing Yizhuang subway are studied.Based on it,three forms of platform design,such as one-island-two-side with two lines,one-island-one-side with two lines,and one-island-one-side with three lines,are expatiated.Then,this paper compares the waiting conditions,back-turning capacity,conditions of sections for leaving and arriving and the station dimensions of the three forms.From point of the impact factors to frontal back-turning capacity of island-platforms,as well as the impact of the platform passenger organizing program to platform's width and train stopping time,this paper draws a conclusion that the one-island-two-side with two lines platform suits the original stations of urban rail transit with island-platform and frontal back-turning section.