The purpose of this research was to obtain a crystalline inulin of chicory roots, growing in Poland, and dried up in industrial terms, and also comparing useability of crystalline inulin, and the evaluation of composition of carbohydrates in inulin preparations. The carbohydrates composition was determined by HPLC method. The crystalline inulin had a high purity{94%}.Yield of inulin changes in relation of chicory roots and also of the date of harvest. The largest yield of crystalline inulin has been collected of large roots of harvests to 15^th October. The largest content of inulin {92%} was determind in inulin preparations which were obtained of large roots. Chicory roots dried up in industrial terms have the lower technological value.