The study aimed to determine the effect of teaching by systemic approach  in fifth grade Tafila province students' achievement in science. The sample consists of 42 male and 34 female students, chosen from two schools, one male and the other female. They were randomly  distributed into four groups. Two experimental (taught by systemic approach) and others controlled (taught by conventional approach).

To achieve the study aims, educational program on the environment unit have been administered according to systemic approach and a test and valid multiple choice exam was used. The findings of the study reveals that there were significant statistical differences in the students achievement of science in favor of experimental group and the female students. No significant statistical differences were seen in the interaction between the method of teaching and the students gender.

Based on the results of the study, several recommendations have been suggested, such as using systemic approach in teaching other school subjects and different students levels. It is also recommended to study the effect of teaching by systemic approach to compare the students' science  achievement with other methods of teaching.