Research conclusions：(1)Serious lag of suburban railways planning and construction in some Chinese cities is one cause of delay of city layout adjustment and optimization and one reason of traffic jams exacerbated.The construction thought of first inner city railways then outside the city should be reversed.(2)In some cities,partial sections of suburban railways are replaced as urban subways which has led amount of suburban railway too little,and single subway too long with longer travailing time and high investment.The whole rail network will tend to be low operational efficiency and poor investment efficiency.(3)Suburban railways should as far as possible pass through or into the downtown.and interchange with ring railway or subway stations located in the downtown.(4)Cherish the existing railway corridor resources in urban areas.(5)Finance in plural investment mode for construction of suburban railway.(6)Set up moderate technical standards and save investment of construction and operation.(7)Research and formulate uniform technical standards early.(8)111e network of city railway should be approved by the national department.(9)Cultivate professional team for design,advisory and construction management.(10)Offer reasonable working hours for suburban railway design,construction and commissioning.