Diagnostic coronary angiography, is an invasive cardiovascular diagnosis of coronary artery disease. The aim of this study was to determine the effect of sour orange aromatherapy on physiological indexes and stress in Cardiac patients admitted to coronary angiography. Inclusion criteria: patient willingness to participate in the study; Smell test positive, patients who are undergoing coronary angiography for the first time; patients who are not taken nitrate and housing from 6 hours ago, do not have allergies and determine which factors like hospitalization and treatment for mental health problems. Exclusion criteria: history of drug addiction; the disorders of smell and patients who underwent an emergency are angiogenesis. This study would be a randomized clinical trial of the two groups in 2017, Research community will be patients Hospitalized in cardiac angiography Heshmat Hospital in Rasht, with a sample size of 36 participants in each group. All three forms to collect demographic, physiological, standard anxiety questionnaire "Speal Berger" will be used. First, using a standard anxiety questionnaire " Speal burger", patients is known with high levels of anxiety (over 43), then Will be in the group with aromatherapy or without it by simple random sampling. To compare the two groups, including the pre-test, analysis of variance will be used and to examine the relationship between qualitative variables, Chi-square test will be used.