Abstract: In order to understand the resource status of natural forest in Sichuan province, identify the cause and the evolution law of natural forest resources, and provide important reference and scientific basis for the protection and restoration of natural forest in Sichuan province. In this paper, the data of natural forest resources in the whole province from 1979 to 2017 were deeply analyzed. The results showed that the area, volume and unit volume of natural forest increased on the whole, and the area and unit volume showed a trend of ‘decreasing-increasing-decreasing’, and the overall volume increased with time. The age group structure of natural forest was unbalance, and the proportion of nearly-mature forest and mature and over-mature forest was out of balance. The area and volume ratio of non-commercial forest and commercial forest changed from 3∶7 to 8∶2 and 1∶9 to 9∶1, respectively. The area ratio of coniferous forest and broadleaved forest changed from 10∶0 to 6∶4. Therefore, improving the quality of natural forest, optimizing the age group structure, and strengthening the tending of young and middle-aged forest and nearly-mature forest were the key points for natural forest protection in our province.