Abstract: In this paper, the dissolution of gelatin from cine film into the processing solutions has been investigated by means of "gel" chromatography and UV spectrophotomethy, and the following results were obtained.1) It was proved that in the film and the processing solution there were extractable and extracted gelatins with molecular weight of 3000-30000.2) According to the solubility at room temperature, the commercial gelatins could be separated into two components "gel" (swelling component) and "sol" (soluble component). The results indicated that degradation of the "sol" goes faster than that of the "gel" due to its weaker ability of aggregation.3) The temperature and the degree of extraction are important factors effecting on the "sol" content in commercial gelatins. The product with minimum content of "sol" could be obtained by extracting gelatin at 50℃ after the extract at 45℃ had been removed. But the content of "sol" would increased with the extracting process in run by run.The experimental results showed that it is necessary to pretreat limed collagen before the extraction and control the degree of extraction, and the problem may thus be solved.