This project on “Guideline constructs for environmental site assessment” was put in place for the Environmental Protection Agency. The target of this project for an environmental site assessment is to develop a procedure named “preparing procedure of analyzing soil contaminants —guidance of environmental site soil contamination assessments”. The guidance is designed to assist the user in developing information about the environmental condition of the site to help the user realizing the soil contamination condition and preparing the soil contaminants analyzed data. The guidance summarizes the requirements and process for evaluating potential liability from environmental contamination, and will introduce users to the larger context of environmental issues associated with real property. Accordance with the guidance one could gather the information of the potential contaminations, potential contaminated source, and kind of contaminants and migrated of contaminants. This project consist the following tasks: 1 Gather and translate related information and guidelines based on American Society for Testing and Materials（ASTM）and other US government organizations (Civilian Federal Agency Task Force, National Park Service, and Environmental Protection Agency ). Including “Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process (E1527)”, ”Standard Practice for Environmental Site Assessments: Transaction Screen Process (E1528)”, ”Standard Guide for Environmental Site Assessments: Phase II Environmental Site Assessment Process (E1903)”, ”Guide on Evaluating Environmental Liability for Property Transfers”,” Level I Re-Acquisition Environmental Site Assessment Guidance Manual”, and”CERCLA Enforcement Against Lenders and Government Entities That Acquire Property Involuntarily”. 2 Compare US Environmental Site Assessment models and construct a guideline named “preparing procedure of analyzing