Two local Thai grasses i.e. Ya Nuannoi (Zeysia matrella Merr.) and Ya Malasia (Axonopus compressus (Swartz) Beauv.) were examined for their suitability as indicator plants for active biomonitoring methods. Identical sets of samples were exposed on Rama IV Rd. and at the King Monguts Institute of Technology Ladkrabang for a period of 2 months. Every 2 weeks, the newly grown plant material was collected and analyzed for the concentration of the heavy metals, Cadmium (Cd), Chromium (Cr), Copper (Cu), Lead (Pb) and Zinc (Zn). The comparative of Ya Nuannoi with Ya Malaysia were found that grass samples at Rama IV Rd. was higher sensitive and could accumulated of Cd < Pb < Cr < Cu < Zn respectively. The maximum concentration of heavy metals in Ya Nuannoi in Rama IV Rd. and in Ladkrabang were 0.25, 6.12, 6.89, 15.09 and 36.87 ppm. and 0.20, 2.18, 6.68, 10.47 and 2.18 ppm. respectively (p< 0.05). The maximum concentration of heavy metals in Ya Malaysia in Rama IV R.d. and in Ladkrabang were 0.33, 4.68, 6.95, 15.25 และ 33.21 ppm. and 0.30, 1.59, 5.19, 9.20 and 24.71 ppm. respectively (p< 0.05). The comparative of Ya Nuannoi with Ryegrass (Lolium multiflorum Lema), European standard indicator grass were found that grass at Rama IV samples was higher sensitive and could accumulate more heavy metal than the samples in ladkrabang by the accumulation of Cr < Pb < Cu < Zn recpectivly. The maximum concentration of Ryegrass and Ya Nuannoi were 7.45, 16.13, 31.15 and 84.65 ppm. and 3.94, 5.32, 12.94, and 33.57 ppm respectively. The concentration of Ryegrass show Ryegrass more sensitive than Yanuannoi but under the Thai climate it can not grow.