This study belongs to the pattern of analytical descriptive studies,which aims to describe and analyze psychological aspects related to environmental affiliation and advocacy in a sample of university students of both sexes , which is the comparison between students of an urban university (Ain-Shams ) university and another university is less civilized (Banha) university . Therefore, this study is considered descriptive studies that measure the relationship between two variables, independent variable is (the belonging) and the dependent variable is (the environmental advocate) This study was based on a sample social survey method for students from Ain-Shams university males and females, and a sample of students from Banha university males and females. The study attempts to test the validity of the following assumptions: There is a statistically significant relationship between environmental affiliation and advocacy among university students of both sexes , there are statistically significant differences in affiliation among universities ,(urban university) and (less urbanized university ) , there are statistically significant differences in gender affiliation , there are statistically significant differences in environmental advocacy among universities and statistically significant differences in environmental advocacy between the sexes . The sample of the study was a random sample of students of both sexes. The sample was (720) from Ain-Shams university (360) from Banha university (180) single male (180) single female. Data were also processed using tests to detect individual differences between averages, standard deviation and Pearson correlation coefficient. The study found that there is a positive correlation between environmental affiliation and motivation in the study sample of males and females. The recommendation of the study: call on civil society and state institutions to do their part through the implementation of programs that increase awareness of belonging and importance of environmental advocacy, and the need to active the function of the ministry of environment through enactment of laws and legislation that prevent and criminalize the infringement on the environment.