由于工程项目具有投资大、工期长、参与单位多的特点，一个项目的合同数量往往会比较多，形成了一个合同群。为有效地对合同进行管理，应按照合同标的内容将合同进行分类。一般的建设工程合同可分为设计类合同、服务类合同和建安类合同三大类。
①设计类合同。主要包括建筑设计、专项设计、市政设计以及与设计有关的咨询合同、顾问合同等。
②服务类合同。主要指不形成建筑实体的咨询、监测、服务类合同，如可研分析、环评咨询、产权办理、监理、造价咨询、招标代理、基坑监测等合司。
③建安类合同。主要指与形成建筑物实体有关的合同，如建安总承包、机电安装及材料设备供货等合同。
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