The preparation of the starch from the grinding and shelling seeds of bean variety “Piękny Jaś” (Phaseolus multiflorus) and broad bean (Vicia faba) variety Bartom were obtained and modification hydrothermal (ratio starch: water – 1:3; temperature 60ºC for broad bean or 62ºC for bean; time 24 h) was applied. The preparations were characterized by high starch content. There was higher starch content in preparation from broad bean (96.3%) than the preparation from bean seeds (91.6%). However amylose content was similarly of both preparation from the seeds of bean and broad bean and amounted 25 i 26%. Water holding capacity in temperature 60°C of starch from bean (6.2 g H₂O/g ) was higher than starch from broad bean (4.4 H₂O/g), so solubility was similarly 9.9 and 10.7% respectively. Increase of temperature to 80°C caused increase solubility and water holding capacity. The starch to mark the rather low digestibility of starch for bean 46,9% and 39,3% for broad bean. Research of PSMH demonstrated, that modification applied caused more further purify the preparation (decreasing of content the ash, protein) and decreasing of amylose content and real surface of starch granules. The modification caused a fall in the water binding capacity and the solubility of the preparations. However, these values increased when temperature was increased from 60ºC to 80ºC. Also there was a considerable improvement in the digestibility in vitro (> 1,5 once) of both preparations.