Compressive strength of aggregates has a great influence on the strength and durability of concrete. Due to the small size of the aggregates, it is not possible to test the compressive strength of aggregates. Therefore, a point load test is used to estimate the compressive strength of aggregates. In addition to the lithology, the environment of aggregates deposition is also effective on point load index. In order to study this issue, two talus environments and two alluvial fan environments were selected in the Deira region and the point load index was evaluated. The results show that the point load index of aggregates in alluvial fan environments is higher than the talus environment. Also, the values of point load index are similar in aggregates of alluvial fan environment. The results of this study indicate that the point load index of aggregates decreases with increasing particle size. However, this decrease in aggregate strength is different in talus and alluvial fan environments so that the talus aggregates, compared to alluvial fan aggregates, experience higher decrease in strength due to the increase in particle size.