Futures studies and observation contributes to the sustainability and effectiveness of planning, which faces uncertainty and ambiguity in the future. Surprises and emerging situations, which are due to the lack of an observation system, indicate the need is research. Delay or non-response to emerging legislative events and trends has led to the surprise and slowness in action and reaction timely, agilely and on time. This shows the importance of the existence of this observation system. The purpose of this research is to design an observation system for the legislation of the Islamic Parliament of Iran. Achieving the goal is followed by descriptive-exploratory method. There is no serious research literature and background. Some studies have indirectly referred to the intermediate themes of legislation and futures studies. “What should be the design of the observation system of the legislation of the Islamic Parliament of Iran?”. The methods of the qualitative research interview and Delphi be used. The statistical community are expert in Futures studies and legislation. Sampling was done by snowball method. The data was collected with the help of questionnaires and interview and based on validity, content validity, and reliability, Cronbach’s alpha. Data analysis with suitable and appropriate methods, including the combination of the results of library research and studies, fuzzy calculations of two fuzzy questionnaires and Fuzzy Delphi with the help of Excel software, content analysis of documents and evidences, and interview and validation based on expert’ opinions was done. Observation system consists of observation system, influencers, impressionables, environmental factors, and manager system. “Proportion of Alternative Futures” as a new, radical and fundamental concept is one of the inputs. The observation system includes inputs, steps and processes, outputs, impacts, and outcomes that are supported by infrastructures, subsystems, and databases and information banks.