The main topic of this research is studying function of agricultural adsorbents as an adsorbent for heavy metals. In this research, Amygdalus Scoparia shell and Tamarind fruit shell activated with sulphuric acid was used as agricultural inexpensive adsorbents for Cr removal. There are five main factors in order to study the optimization of various factors on the rate of adsorption for Amygdalus Scoparia shell: pH(in the range 1 to 11), adsorbent dose(in the range 10 to 40g/L), Initial concentration of Cr(in the range 5 to 150mg/L), contact time(in the range 30 to 240min) and shaker speed(in the range 50 to 200rpm) were investigated in batch reactor. For tamarind fruit shell activated with sulphuric acid: pH(in the range 1 to 12), adsorbent dose(in the range 0/5 to 10g/L), Initial concentration of Cr(in the range 5 to 200mg/L), contact time(in the range 15 to 180min) and shaker speed(in the range 50 to 200rpm) were investigated in batch reactor. It was used RSM design For the main tests in order to reduce the number of tests, saving time , cost beneficial and provide each share of factors. The overall results obtained showed that the equilibrium time was 180min for Amygdalus Scoparia shell and 120min for Tamarind fruit shell activated with sulphuric acid. Langmuir and Freundlich adsorption isotherm are the best describing of adsorption functional in the adsorption equilibrium for the adsorbents used. In optimum conditions, the removal efficiency of chromium from synthetic and real samples for Amygdalus Scoparia shell(pH:1, adsorbent dose:30g/L, adsorbate dose: 5mg/L, contact time: 180min and shaker speed: 200rpm) was obtained 96.1% and 70.3% respectively. In optimum conditions, the removal efficiency of chromium from synthetic and real samples for Amygdalus Scoparia shell(pH:1, adsorbent dose:10g/L, adsorbate dose: 5mg/L, contact time: 120min and shaker speed: 200rpm) was obtained 98.6% and 83.5% respectively that is Indicating the high performance of the materials used in the removal of chromium in comparing of activated carbon. According to the results of ANOVA for Amygdalus Scoparia shell and for Tamarind fruit shell activated with sulphuric acid, all the factors (variables) are significant in studies on chromium removal efficiency. As a conclusion of this study, it is stated that the waste used in this study are able to remove or reduce the concentration of chromium in the aquatic solutions and it can be a cheap option instead of common adsorbents as activated carbon. Keywords : Chromium, Agricultural waste, Wastewater Treatment, Industrial wastewater