Type Ⅰ collagen was extracted from human embryonal bone by alternating acidic and neutral salt precipitation technique and was identified by SDS-PAGE, amino acid analysis and immunological method. The results showed that electrophoresis band of collagen extracted was the same as that of type Ⅰ collagen standard, ring precipitation test was positive, glycine was 1/3 in total of 1000 amino acid residues, the ratio of hydroxyproline and proline was 0.65. These suggested that the extracted collagen accord with the characteristics of type Ⅰ collagen and is highly purified. It could be used to prepare collagen products.