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Temporal variability and describe the abundance and distribution of marine benthic seaweeds that inhabit walls of Ras Muhammad earthquake crack and their relationship to the diagenetic nature of the substratum reef using the field investigation. The study period extended seasonally from spring to winter 2015. The assessment of seaweeds abundance and distribution were performed using the Dominant, Abundant, Frequent, Occasional and Rare (DAFOR) scale, which is a method of defining species abundance and community richness, especially during intertidal rapid surveys, such in our case when the precise numbers or coverage of a species in the field is difficult to measure. A total of 19 seaweeds taxa were collected from Ras Muhammad Earthquake crack belonging to four different algal phyla and had been identified to the level of the species level following the standard taxonomically guides which dealing with the seaweeds of the Indo-pacific region and the general references of the tropical and subtropical areas. The Chlorophyta is the most diverse division and prevailed with 9 taxa followed by Rhodophyta (5 taxa), then Ochrophyta (3 taxa), and the last division is Cyanophyceae (2 taxa).This study emphasizes the significant impact of seasonal variations, especially temperature, and Salinity on the temporal distribution and Biomass of seaweeds taxa in Ras Muhammad Earthquake crack. [ABSTRACT FROM AUTHOR]